Tested in both multiplayer and singleplayer 1.21.4. VB does not render any blocks, but still renders entities. VE works fine.
Mod list:
[✔] appleskin-fabric-mc1.21.3-3.0.6
[✔] Axiom-4.9.0-for-MC1.21.4
[✔] BetterF3-13.0.0-Fabric-1.21.4
[✔] BetterPingDisplay-Fabric-1.21.4-1.1.1
[✔] CFX-1.9
[✔] cloth-config-17.0.144-fabric
[✔] cwb-fabric-3.0.0+mc1.21.3
[✔] dynamic-fps-3.9.4+minecraft-1.21.2-fabric
[✔] enhancedblockentities-0.11.3+1.21.4
[✔] entity_model_features_fabric_1.21.4-2.4.1
[✔] entity_texture_features_fabric_1.21.4-6.2.10
[✔] entityculling-fabric-1.7.4-mc1.21.4
[✔] fabric-api-0.119.2+1.21.4
[✔] fast-ip-ping-v1.0.5-mc1.21.1-fabric
[✔] figura-0.1.5b+1.21.4-fabric-mc
[✔] Flashback-0.32.0-for-MC1.21.4
[✔] ForgeConfigAPIPort-v21.4.1-1.21.4-Fabric
[✔] freecam-fabric-1.3.2+mc1.21.4
[✔] ImmediatelyFast-Fabric-1.8.0+1.21.4
[✘] iris-fabric-1.8.8+mc1.21.4.jar (disabled)
[✔] krypton-0.2.8
[✔] language-reload-1.7.3+1.21.4
[✔] litematica-fabric-1.21.4-0.21.3
[✔] litematica-printer-1.21.4-3.2.1
[✔] lithium-fabric-0.15.3+mc1.21.4
[✔] malilib-fabric-1.21.4-0.23.3
[✔] mixintrace-1.1.1+1.17
[✔] modelfix-1.21.3-1.10-fabric
[✔] modmenu-13.0.3
[✔] morechathistory-1.3.1
[✔] moreculling-fabric-1.21.4-1.2.10
[✔] MouseTweaks-fabric-mc1.21.3-2.27
[✔] NBTac-FABRIC-1.21.4-1.3.11
[✔] NBTcopy-FABRIC-1.20.1-1.0.4
[✔] NoChatReports-FABRIC-1.21.4-v2.11.0
[✔] noglow-1.1.1
[✔] placeholder-api-2.5.2+1.21.3
[✔] reeses-sodium-options-fabric-1.8.3+mc1.21.4
[✔] rrls-5.1.2+mc1.21.4-fabric
[✔] sodium-extra-fabric-0.6.1+mc1.21.4
[✔] sodium-fabric-0.6.13+mc1.21.4
[✔] visible-entities-0.1.4+mc1.21.4
[✘] visiblebarriers-1.21-2.0.15.1.zip (disabled)
[✔] visiblebarriers-1.21.4-2.0.20
[✔] WI-Zoom-1.6-MC1.21.4
[✔] yet_another_config_lib_v3-3.6.6+1.21.4-fabric
Computer is an M4 macbook pro, but I tested this on my old Intel macbook pro and it has the same issue.

what launcher
Prism Launcher 9.4

does this happen without the other mods? and can you check which mod is causing the issue if not?

does this happen without the other mods? and can you check which mod is causing the issue if not?

The glitch still occurs without any other mods (except for fabric api) installed.

you have pressed the keybinds right?
…

yes of course :3

has any progress been made on this? i'm sorry if i'm being pushy but this would be really useful if fixed, thanks

i'm a bit limited on this because I can't reproduce the issue

im having the same issue on 1.20.4

Cannot reproduce on Arch Linux w/ Intel i7-1300HX and RTX 4060 Laptop GPU. @LuveelVoom or @2012hhh2012 do you have any possible info that could help? Screenshots? Error logs? Changed settings? Config files? Hardware drivers? Java versions?

This issue no longer occurs on Visible Barriers 1.21.6. I'll leave this open since someone else has the same issue, but something appears to have resolved itself.

This issue is now occurring again. The only thing that I can think of that happened was that my game crashed due to a faulty resource pack? Could that be related?

To test this, I created a new instance of my current pack, added visible barriers, and launched. Lo and behold, it worked.

(Mods:
[✔] appleskin-fabric-mc1.21.6-3.0.6
[✔] Axiom-4.9.1-for-MC1.21.6
[✔] cloth-config-19.0.147-fabric
[✔] cwb-fabric-3.0.0+mc1.21.5
[✔] dynamic-fps-3.9.6+minecraft-1.21.6-fabric
[✔] entity_model_features_fabric_1.21.6-2.4.4
[✔] entity_texture_features_fabric_1.21.6-6.2.14
[✔] entityculling-fabric-1.8.1-mc1.21.6
[✔] fabric-api-0.129.0+1.21.7
[✔] fast-ip-ping-v1.0.7-mc1.21.6-fabric
[✔] Flashback-0.35.2-for-MC1.21.6
[✔] ForgeConfigAPIPort-v21.7.0-1.21.7-Fabric
[✔] freecam-fabric-1.3.4+mc1.21.6
[✔] ImmediatelyFast-Fabric-1.11.1+1.21.7
[✘] iris-fabric-1.9.1+mc1.21.7.jar (disabled)
[✔] krypton-0.2.9
[✔] language-reload-1.7.4+1.21.6
[✔] litematica-fabric-1.21.7-0.23.1
[✔] lithium-fabric-0.18.0+mc1.21.7
[✔] malilib-fabric-1.21.7-0.25.1
[✔] mixintrace-1.1.1+1.17
[✔] modelfix-1.21.5-1.12-fabric
[✔] modmenu-15.0.0-beta.3
[✔] morechathistory-1.3.1
[✔] moreculling-fabric-1.21.6-1.4.0-beta.1
[✔] MouseTweaks-fabric-mc1.21.3-2.27
[✔] NBTac-FABRIC-1.21.6-1.3.12
[✔] no-dialog-warning-1.0.0
[✔] NoChatReports-FABRIC-1.21.7-v2.14.0
[✔] placeholder-api-2.7.1+1.21.6
[✔] reeses-sodium-options-fabric-1.8.4+mc1.21.6
[✘] rrls-5.1.8+mc1.21.6-fabric.jar (disabled)
[✔] sodium-extra-fabric-0.6.6+mc1.21.6
[✔] sodium-fabric-0.6.13+mc1.21.6
[✔] visiblebarriers-1.21.6-2.0.24
[✔] WI-Zoom-1.6-MC1.21.7
[✔] yet_another_config_lib_v3-3.7.1+1.21.6-fabric)

I have not the slightest clue how visible barriers is getting into some permanently borked state after some event. Removing it and readding it to the previous instance didn't even fix it.