Version: 1.16.4 (Possibly 1.16.5 as well)

Forge Version: 35.1.37 and beyond

Steps to recreate:

• Install Primal Winter
• Install Snow Under Trees to make it easier to see the glitch.
• Find a biome where the trees have vines, and try to move around.

Essentially, there's a glitch in Primal Winter, where snowy vines process layers of snow in the block directly under them as a full block from certain directions, essentially resulting in invisible blocks in place of snow layers. This glitch makes navigating jungles and swamps particularly frustrating.

I'm not supporting 1.16 anymore; and have not been able to reproduce or see evidence of this issue myself in this or later versions. As such, I'm closing this issue.