If you look closely at the potion you can see the z fighting at the blue part circled. I haven't noticed this on a water bottle, only the potion. It isnt too much of a problem and I barely even noticed it but it would be a nice extra touch to fix. To recreate it, just drink any potion like nightvision as its the easiest one to see based of of my observations.
[media]Linked issues
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Duplicate of MC-167526
Can confirm that this is an issue. Also affects 20w51a. This can be more easily be seen by throwing a potion that has the enchantment glint on to the floor and viewing it in spectator mode.