Versions:

• Forge: 47.1.43
• Minecraft: 1.20.1
• Rubidium: 0.7.0

Issue:
Modded Blocks which require full or semi-transparency render without transparency. Vanilla blocks DO NOT have the same issue.

Without Rubidium:

With Rubidium:

Mod list:
client-1.20.1-20230612.114412-srg.jar
rsrequestify-1.20.1-2.3.2.jar
torchmaster-20.1.4.jar
trade-cycling-forge-1.20.1-1.0.7.jar
fullbrightnesstoggle-1.20.1-3.0.jar
moonlight-1.20-2.7.2-forge.jar
Compressium-3.0.2-build.12+mc1.20.jar
jei-1.20.1-forge-15.2.0.23.jar
spectrelib-forge-0.13.12+1.20.1.jar
easy_villagers-1.20.1-1.0.12.jar
rubidium-mc1.20.1-0.7.0.jar
flywheel-forge-1.20-0.6.9-4.jar
create-1.20.1-0.5.1.d.jar
waystones-forge-1.20-14.0.1.jar
collective-1.20.1-6.65.jar
Controlling-forge-1.20.1-12.0.2.jar
Searchables-forge-1.20.1-1.0.1.jar
polymorph-forge-0.49.0+1.20.1.jar
comforts-forge-6.3.3+1.20.1.jar
storagedrawers-1.20.1-12.0.2.jar
NaturesCompass-1.20.1-1.11.1-forge.jar
elevatorid-1.20.1-1.8.14.jar
cfm-forge-1.20.1-7.0.0-pre36.jar
ferritecore-6.0.0-forge.jar
balm-forge-1.20-7.0.7.jar
Terralith_1.20.1_v2.4.3.jar
justzoom_forge_1.0.2_MC_1.20.1.jar
mininggadgets-1.15.0.jar
JustEnoughResources-1.20.1-1.4.0.222.jar
forge-1.20.1-47.1.43-universal.jar
supplementaries-1.20-2.5.21.jar
refinedstorage-1.12.3.jar
refinedstorageaddons-0.10.0.jar
konkrete_forge_1.6.1-2_MC_1.20.jar

Extra info:
Issue also appeared while using the mod "Twigs": The twig and the rock items (and possibly more) rendered a brown and gray square around the actual block when placed. I do not have any screenshots of this since I removed the mod before investigating the issue.

If you need any more information just let me know :)

Update to 0.7.0a