See title, only happens if you hold a barrier, and solely if you switch from New Default textures to apparently any other resource pack, in my case the Old Programmer Art pack.
[media]
MC-163048
Barrier particle changes to a random texture after changing resource pack
Resolved
Fixed
2
Confirmed
Important
Rendering, Textures and models
barrier, rendering
19w41a
19w45a
Retrieved
Can confirm. This happens when switching from any resource pack to another resource pack. In my case, I switched to a faithful resource pack and got a bamboo sprite.
Edit: And a raw beef sprite when I switched back to default.