Will confirm at least. This occurs with other shapes and can be recreated from scratch so seems worthwhile to check.
Oh I think I know what's up, try this: Play the animation in Blender at least once so all the simulation data from Geometry Nodes is "baked"/cached. Then do the USD export with Animation checked.…
However, I'm a little confused why the animation time samples (for widths and positions) don't get saved when exporting the attached
usd_attribute_varying_test.blend
when the animation export…
I'll change the title a bit after this edit but the problem here isn't limited to generated images. Any 1-tile UDIM image will be treated as-if it were just a regular image and the image's…
That other difference should be a separate issue as it'll need to be solved much differently than the primary fix for this one. What's happening is that the Image "extension" setting of "Repeat"…