I've had this issue happen a few times now, here's a recreation: https://streamable.com/vsd0tb

To recreate, have 2 gravity blocks, and break the bottom one. Crashes the game in both SP and MP.

Crash Report:
---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 2022-06-11, 8:20 p.m.
Description: Rendering entity in world

java.lang.NullPointerException: Cannot invoke "net.fabricmc.fabric.api.renderer.v1.Renderer.meshBuilder()" because the return value of "net.fabricmc.fabric.api.renderer.v1.RendererAccess.getRenderer()" is null
at me.pepperbell.continuity.impl.client.ProcessingContextImpl.(ProcessingContextImpl.java:19)
at me.pepperbell.continuity.client.model.CTMBakedModel$CTMQuadTransform.(CTMBakedModel.java:70)
at me.pepperbell.continuity.client.model.ModelObjectsContainer.(ModelObjectsContainer.java:10)
at java.base/java.lang.ThreadLocal$SuppliedThreadLocal.initialValue(ThreadLocal.java:305)
at java.base/java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:195)
at java.base/java.lang.ThreadLocal.get(ThreadLocal.java:172)
at me.pepperbell.continuity.client.model.ModelObjectsContainer.get(ModelObjectsContainer.java:18)
at me.pepperbell.continuity.impl.client.ContinuityFeatureStatesImpl.get(ContinuityFeatureStatesImpl.java:16)
at me.pepperbell.continuity.api.client.ContinuityFeatureStates.get(ContinuityFeatureStates.java:10)
at net.minecraft.class_901.handler$zze000$beforeRenderModel(class_901.java:518)
at net.minecraft.class_901.method_3965(class_901.java:45)
at net.minecraft.class_901.method_3936(class_901.java:17)
at net.minecraft.class_898.method_3954(class_898.java:141)
at net.minecraft.class_761.method_22977(class_761.java:1567)
at net.minecraft.class_761.method_22710(class_761.java:1315)
at net.minecraft.class_757.method_3188(class_757.java:1039)
at net.minecraft.class_757.method_3192(class_757.java:816)
at net.minecraft.class_310.method_1523(class_310.java:1143)
at net.minecraft.class_310.method_1514(class_310.java:734)
at net.minecraft.client.main.Main.main(Main.java:237)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at me.pepperbell.continuity.impl.client.ProcessingContextImpl.(ProcessingContextImpl.java:19)
at me.pepperbell.continuity.client.model.CTMBakedModel$CTMQuadTransform.(CTMBakedModel.java:70)
at me.pepperbell.continuity.client.model.ModelObjectsContainer.(ModelObjectsContainer.java:10)
at java.base/java.lang.ThreadLocal$SuppliedThreadLocal.initialValue(ThreadLocal.java:305)
at java.base/java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:195)
at java.base/java.lang.ThreadLocal.get(ThreadLocal.java:172)
at me.pepperbell.continuity.client.model.ModelObjectsContainer.get(ModelObjectsContainer.java:18)
at me.pepperbell.continuity.impl.client.ContinuityFeatureStatesImpl.get(ContinuityFeatureStatesImpl.java:16)
at me.pepperbell.continuity.api.client.ContinuityFeatureStates.get(ContinuityFeatureStates.java:10)
at net.minecraft.class_901.handler$zze000$beforeRenderModel(class_901.java:518)
at net.minecraft.class_901.method_3965(class_901.java:45)
at net.minecraft.class_901.method_3936(class_901.java:17)
at net.minecraft.class_898.method_3954(class_898.java:141)
at net.minecraft.class_761.method_22977(class_761.java:1567)
at net.minecraft.class_761.method_22710(class_761.java:1315)
at net.minecraft.class_757.method_3188(class_757.java:1039)

-- Entity being rendered --
Details:
Entity Type: minecraft:falling_block (net.minecraft.class_1540)
Entity ID: 42179
Entity Name: Falling Block
Entity's Exact location: 1436.50, 64.00, -1147.50
Entity's Block location: World: (1436,64,-1148), Section: (at 12,0,4 in 89,4,-72; chunk contains blocks 1424,-64,-1152 to 1439,319,-1137), Region: (2,-3; contains chunks 64,-96 to 95,-65, blocks 1024,-64,-1536 to 1535,319,-1025)
Entity's Momentum: 0.00, 0.00, 0.00
Entity's Passengers: []
Entity's Vehicle: null
Immitating BlockState: Block{minecraft:gravel}
Stacktrace:
at net.minecraft.class_898.method_3954(class_898.java:141)
at net.minecraft.class_761.method_22977(class_761.java:1567)
at net.minecraft.class_761.method_22710(class_761.java:1315)
at net.minecraft.class_757.method_3188(class_757.java:1039)
at net.minecraft.class_757.method_3192(class_757.java:816)
at net.minecraft.class_310.method_1523(class_310.java:1143)
at net.minecraft.class_310.method_1514(class_310.java:734)
at net.minecraft.client.main.Main.main(Main.java:237)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

-- Renderer details --
Details:
Assigned renderer: net.minecraft.class_901@5db6da34
Location: -4.20,0.38,0.78 - World: (-5,0,0), Section: (at 11,0,0 in -1,0,0; chunk contains blocks -16,-64,0 to -1,319,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,-64,0 to -1,319,511)
Rotation: 0.0
Delta: 0.86000854
Stacktrace:
at net.minecraft.class_898.method_3954(class_898.java:141)
at net.minecraft.class_761.method_22977(class_761.java:1567)
at net.minecraft.class_761.method_22710(class_761.java:1315)
at net.minecraft.class_757.method_3188(class_757.java:1039)
at net.minecraft.class_757.method_3192(class_757.java:816)
at net.minecraft.class_310.method_1523(class_310.java:1143)
at net.minecraft.class_310.method_1514(class_310.java:734)
at net.minecraft.client.main.Main.main(Main.java:237)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

-- Affected level --
Details:
All players: 1 total; [class_746['aschwan41'/41936, l='ClientLevel', x=1440.70, y=62.00, z=-1148.28]]
Chunk stats: 16384, 539
Level dimension: minecraft:overworld
Level spawn location: World: (48,93,-32), Section: (at 0,13,0 in 3,5,-2; chunk contains blocks 48,-64,-32 to 63,319,-17), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,-64,-512 to 511,319,-1)
Level time: 251871698 game time, 37072842 day time
Server brand: fabric
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.class_638.method_8538(class_638.java:453)
at net.minecraft.class_310.method_1587(class_310.java:2288)
at net.minecraft.class_310.method_1514(class_310.java:753)
at net.minecraft.client.main.Main.main(Main.java:237)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

-- Last reload --
Details:
Reload number: 1
Reload reason: initial
Finished: Yes
Packs: Default, Fabric Mods, [1.16+]+Reni's+Hidden+Totem+(FP++TP).zip, continuity/default

-- System Details --
Details:
Minecraft Version: 1.19
Minecraft Version ID: 1.19
Operating System: Windows 10 (amd64) version 10.0
Java Version: 17.0.3, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 823604544 bytes (785 MiB) / 1342177280 bytes (1280 MiB) up to 2147483648 bytes (2048 MiB)
CPUs: 12
Processor Vendor: AuthenticAMD
Processor Name: AMD Ryzen 5 3600 6-Core Processor
Identifier: AuthenticAMD Family 23 Model 113 Stepping 0
Microarchitecture: unknown
Frequency (GHz): 3.59
Number of physical packages: 1
Number of physical CPUs: 6
Number of logical CPUs: 12
Graphics card #0 name: NVIDIA GeForce RTX 3050
Graphics card #0 vendor: NVIDIA (0x10de)
Graphics card #0 VRAM (MB): 4095.00
Graphics card #0 deviceId: 0x2507
Graphics card #0 versionInfo: DriverVersion=30.0.15.1215
Memory slot #0 capacity (MB): 8192.00
Memory slot #0 clockSpeed (GHz): 2.40
Memory slot #0 type: DDR4
Memory slot #1 capacity (MB): 8192.00
Memory slot #1 clockSpeed (GHz): 2.40
Memory slot #1 type: DDR4
Virtual memory max (MB): 34760.71
Virtual memory used (MB): 20985.82
Swap memory total (MB): 18432.00
Swap memory used (MB): 727.08
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Fabric Mods:
betterf3: BetterF3 1.3.1
cloth-config: Cloth Config v6 7.0.65
cloth-basic-math: cloth-basic-math 0.6.1
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.5.3+9e7660c6a9
chunkpregen: Fabric Chunk Pregenerator 0.3.3
continuity: Continuity 2.0.0+1.19
fabric: Fabric API 0.55.3+1.19
fabric-api-base: Fabric API Base 0.4.9+e62f51a3a9
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.6.6+9ff28f40a9
fabric-biome-api-v1: Fabric Biome API (v1) 9.0.12+e62f51a3a9
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.18+9ff28f40a9
fabric-command-api-v1: Fabric Command API (v1) 1.2.5+f71b366fa9
fabric-command-api-v2: Fabric Command API (v2) 2.1.1+cda9839ba9
fabric-commands-v0: Fabric Commands (v0) 0.2.22+df3654b3a9
fabric-containers-v0: Fabric Containers (v0) 0.1.27+df3654b3a9
fabric-content-registries-v0: Fabric Content Registries (v0) 3.0.16+9ff28f40a9
fabric-convention-tags-v1: Fabric Convention Tags 1.0.8+37622d24a9
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.2.3+bd0a0d4aa9
fabric-data-generation-api-v1: Fabric Data Generation API (v1) 5.0.1+2a5b9210a9
fabric-dimensions-v1: Fabric Dimensions API (v1) 2.1.27+72da3b3da9
fabric-entity-events-v1: Fabric Entity Events (v1) 1.4.16+9ff28f40a9
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.26+9ff28f40a9
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.24+df3654b3a9
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.19+18990361a9
fabric-item-api-v1: Fabric Item API (v1) 1.5.4+767db26ea9
fabric-item-groups-v0: Fabric Item Groups (v0) 0.3.23+9ff28f40a9
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.0.18+9ff28f40a9
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.2.16+df3654b3a9
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.0.9+21a5acaaa9
fabric-loot-api-v2: Fabric Loot API (v2) 1.0.1+9e7660c6a9
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.1.1+9e7660c6a9
fabric-message-api-v1: Fabric Message API (v1) 1.0.1+513f4a59a9
fabric-mining-level-api-v1: Fabric Mining Level API (v1) 2.1.7+9ff28f40a9
fabric-models-v0: Fabric Models (v0) 0.3.15+9ff28f40a9
fabric-networking-api-v1: Fabric Networking API (v1) 1.0.27+7fe97409a9
fabric-networking-v0: Fabric Networking (v0) 0.3.14+df3654b3a9
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 4.0.5+9ff28f40a9
fabric-particles-v1: Fabric Particles (v1) 1.0.8+dc39553aa9
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.9.16+92cf9a3ea9
fabric-renderer-api-v1: Fabric Renderer API (v1) 1.0.8+9ff28f40a9
fabric-renderer-indigo: Fabric Renderer - Indigo 0.6.6+9ff28f40a9
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 3.2.18+df3654b3a9
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.12+9ff28f40a9
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 3.0.5+9ff28f40a9
fabric-rendering-v0: Fabric Rendering (v0) 1.1.20+df3654b3a9
fabric-rendering-v1: Fabric Rendering (v1) 1.10.14+9ff28f40a9
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 2.0.9+e62f51a3a9
fabric-screen-api-v1: Fabric Screen API (v1) 1.0.23+9ff28f40a9
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.2.6+9ff28f40a9
fabric-textures-v0: Fabric Textures (v0) 1.0.18+9ff28f40a9
fabric-transfer-api-v1: Fabric Transfer API (v1) 2.0.8+e62f51a3a9
fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 1.1.1+9e7660c6a9
fabricloader: Fabric Loader 0.14.7
fallingtree: FallingTree 3.6.1
ferritecore: FerriteCore 4.2.1
iris: Iris 1.2.5
org_anarres_jcpp: jcpp 1.4.14
java: OpenJDK 64-Bit Server VM 17
minecraft: Minecraft 1.19
shulkerboxtooltip: Shulker Box Tooltip 3.0.9-beta.1+1.19-rc2
mm: Manningham Mills 2.3
sodium: Sodium 0.4.2+build.16
org_joml_joml: joml 1.10.4
Loaded Shaderpack: (off)
Launched Version: fabric-loader-0.14.7-1.19
Backend library: LWJGL version 3.3.1 SNAPSHOT
Backend API: NVIDIA GeForce RTX 3050/PCIe/SSE2 GL version 3.2.0 NVIDIA 512.15, NVIDIA Corporation
Window size: 1920x1017
GL Caps: Using framebuffer using OpenGL 3.2
GL debug messages:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
Graphics mode: fancy
Resource Packs: vanilla, Fabric Mods, file/[1.16+]+Reni's+Hidden+Totem+(FP++TP).zip (incompatible), continuity/default
Current Language: English (US)
CPU: 12x AMD Ryzen 5 3600 6-Core Processor

After filtering through my mods, it only occurs when the Continuity mod is also run. Not sure if this is the right place for this now.

Install Indium.