Wall lanterns and hanging signs fail to load with debug textures displayed. Seems to only affect some Supplementaries blocks. They're tracking this issue in their repository and seems to be a conflict with the new Connected Textures mod (CTM) that got added in 1.4.4.

MehVahdJukaar/Supplementaries#395

I attempted to hotfix this by removing CTM + Chipped on the server-side but that didn't do it.
Submitted to #bug-reports in the Discord, too

Fixed in 1.4.5