Also a pretty irrelevant bug report for 1.12.2, but 1.14 allowed the third person camera to pass through blocks with no collision and 1.16 allowed it to pass through visually transparent blocks, so if the bug is present in 1.16 this may be higher priority in that case.

Please report these bugs to the Gilded-Games/The-Aether repo.

Can confirm this bug is not present in 1.16: