I saw this in my private server since the release of the 1.15 snapshots. It happens when I put a item in a item frame, when I put the third person camera or when I go to sleep.
MC-167780
Potions and enchanted objects are not shine.
Resolved
Awaiting Response
0
(Unassigned)
Unconfirmed
(Unassigned)
armor, potions, rendering, texture
1.15
Retrieved
This was supposedly fixed in pre-3: MC-166374
Is this still the case for you in 1.15.1?