Hello!
I’m glad the Water Elemental Glyph problem is getting a fix in 12.0.1. The first time I summon it after logging in, it’s the default water elemental and I have to resummon it for it to have it’s glyphed appearance from the previous icy veins talents. I assume this will be fixed once the glyphs are actually working and being able to apply to the water elemental spell.
However there are further issues you need to look into about the Water elemental. Every time I mount and fly it gets dismissed, when I land and dismount the error text “You do not have a pet to summon” appears, it is gone, and I have to re-summon the water elemental - every single time. This is extremely annoying. Especially since I might land into a new encounter and the first thing I need to do is summon the elemental rather than clicking on a damage skill.