Trinket Shulker Boxes: 2.0.0
Trinkets: 3.0.4
Fabric: 0.11.7 - 1.17.1
Observed Behavior: no texture
Expected Behavior: normal shulker box texture

Crash Log: no crash :)

Not sure what's happening here as I was never able to reproduce it, but I released an update that updated some dependencies so try the newest version and see if this is still an issue.