I have some oak signs in the background of a scene, but they just appear blank during the replay. Why could that be? I didn't find much by googling except for this post from 2015 that claims the problem was fixed.

I am using Minecraft 1.15.2 and replay mod v. 2.3.1 for that version.

Cannot reproduce.

https://paste.ee/p/cSfp5

Ah, my bad. Something must have broken that particular recording, as the controls were inverted too. It's working fine now.