Perfect
With latest glTF transform your previous toktx version should work too btw
the newer version
after updating and on toktx v4.1.0-rc3~4 it fails the build on the same texture.
Is there a chance that the font error might bubble up into more errors?
I’m off for today, but i’m more then happy to test stuff further if needed. I’ll be waiting for the font fix until then 
Nope the font error cant affect this
ok 