More loosely relates to these issues: MC-144009 MC-145821 MC-164001 MC-165403
The bug
If translucent pixels are present in any of the three UI sprites brewing stands use, they are rendered completely opaque in-game, which is not correct.
The bottle textures are baked into the UI for some reason rather than being separate sprites like all other outline-type textures (MC-74408), and as such are not included.
How to reproduce
Download and apply the attached resource pack
Start brewing
Observe
Expected results
Translucent textures where the fuel, arrow and bubbles would be.
Actual results
Entirely opaque.
Linked issues
relates to
Attachments
Comments

Can confirm.