Issues

Particles:
Particles appear through all mirrors while also being reflected by mirrors:

Water:
Water (Still and Flowing) appears through all mirrors:

Lava however, does not appear through mirrors:

Stacked Dimensions:
Blocks from stacked dimensions below the overworld can be seen through mirrors. This only appears to appy to mirrors activated on the tops of glass blocks:

You can see Steve's head appears to "clip" through the non-existing obsidian blocks.

Clouds:
While difficult to demonstrate in a screenshot, clouds appear through and are reflected by mirrors:

Versions:

• Minecraft: 1.17.1
• IP: 0.12
• Fabric API: 0.37
• All screenshots were taken with Optifabric, however I have verified these issues still exist without Optifabric installed.
• No other mods present

Probably fixed https://github.com/qouteall/ImmersivePortalsMod/releases/tag/v0.14-1.17

Verified the issue is gone.