On the newest 1.21 version of Fabric, whenever I have Continuity and I try to load my VT resource pack, it always fails. I tried removing the clean glass options, but that didn't work. My hypothesis is that all texture packs that change any block texture fail to load with continuity.

Do you have Sodium installed? You must have Indium installed as well in that case.

Since there has been no response in a few days I will assume the above solution was adequate.