Minecraft v1.16.5
Forge v36.1.32
Ceiling Torch v1.13.1

Upon placing a Ceiling Torch, I found out that I could not walk through it.

Figured it out, there was a snow layer under the ceiling torch. For some reason, the snow layer becomes a solid block when a ceiling torch is above it. I will test a bit more to see if that happens with only ceiling torches.

(It got pretty laggy while recording)

With the Orc Torch from Lord of the Rings, I was able to stand above the snow layer as a full block collision.

Seems to work for me.

Strange, I'll send a video. Maybe one of the compat torches causes it?

I doubt it, because collision is a per-block setting. But I'll try with all compats turned on.

EDIT: No, that's not it. Collision is still working as intended.

I still cannot reproduce the issue on my end, it could be that one of the other mods you have installed is changing how snow's collision works, and contains a bug in that logic.

Ok, tested it a bit more, and the snow layer collision becomes solid with any block placed above it, including wall torches. I suspect that snow real magic is the cause of it. Looks like it was just pure luck that I found this bug. :D.