Ah got it, so yes for the Universal shader there, that is just what it does and why I made the Ultra shader. (But apparently it works fine in builds?)
Do you have any screenshots of the weird artifacts in the Ultra shader? It sounds like... hm, the material/font is changing, but the UVs don't update to match immediately which they really should. Saving *should* usually correct that, but that's odd... if an error showed up that got cleared (an error I would like to fix btw), STM might have entered a stalled state. If you select the object in the hierarchy and press ctrl+d to duplicate it, does anything change on the new object created?