Couldn’t find this reported anywhere else, but the Wall of Shields passive in the Shield Bash tree causes the shields from Ring of Shields to dissapear after it activates.
You can see an example of this here: Wall of Shields visual bug - Last Epoch - YouTube
At first I thought this was a tooltip error neglecting to inform me that the shields would be consumed upon use, but then I noticed that the buff from ring of shields remained active despite the shields not being visible.
Hey there, I recently respecced out of shield bash, so I tried speccing into it on another character and managed to replicate it there. Here’s another video example and some screenshots. Hope this helps!