I am told it can crash a server but my experience is that it makes all entities (players include) invisible.

this stays even when going between single and multiplayer worlds until you restart the client.

version 2,3,2 on minecraft 1.16.5

java.lang.UnsupportedOperationException: null
at java.util.concurrent.ThreadLocalRandom.setSeed(ThreadLocalRandom.java:191) ~[?:?]
at net.minecraft.class_1095.method_4707(class_1095.java:564) ~[intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_2680.recomputeIfNeeded(class_2680.java:545) ~[intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_2680.getQuads(class_2680.java:565) ~[intermediary-minecraft-1.16.5-client.jar:?]
at io.github.coolmineman.bitsandchisels.BitsBlockEntity.doQuad(BitsBlockEntity.java:177) ~[bitsandchisels-2.3.2.jar:?]
at io.github.coolmineman.bitsandchisels.BitsBlockEntity.rebuildMesh(BitsBlockEntity.java:236) ~[bitsandchisels-2.3.2.jar:?]
at io.github.coolmineman.bitsandchisels.BitsBlockEntity.fromClientTag(BitsBlockEntity.java:325) ~[bitsandchisels-2.3.2.jar:?]
at net.minecraft.class_634.redirect$blh000$deserializeBlockEntityChunkData(class_634.java:6987) ~[intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_634.method_11128(class_634.java:787) ~[intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_2672.method_11528(class_2672.java:123) ~[intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_2672.method_11054(class_2672.java:23) ~[intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_2600.method_11072(class_2600.java:21) ~[intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_1255.method_18859(class_1255.java:144) [intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_4093.method_18859(class_4093.java:23) [intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_1255.method_16075(class_1255.java:118) [intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_1255.method_5383(class_1255.java:103) [intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_310.method_1523(class_310.java:1015) [intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.class_310.method_1514(class_310.java:681) [intermediary-minecraft-1.16.5-client.jar:?]
at net.minecraft.client.main.Main.main(Main.java:215) [intermediary-minecraft-1.16.5-client.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?]
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:234) [fabric-loader-0.11.6.jar:?]
at net.fabricmc.loader.launch.knot.Knot.launch(Knot.java:153) [fabric-loader-0.11.6.jar:?]
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:28) [fabric-loader-0.11.6.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?]
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:210) [NewLaunch.jar:?]
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:245) [NewLaunch.jar:?]
at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]

fixed by vanilla changes in 1.17