I've recreated this report but now used a vanilla client instead of optifine.
An incorrect potion effect is displayed after drinking a shorter, stronger potion and then a longer, weaker potion. The effects are normal, though when the longer one runs out, the display in the inventory shows the stronger potion effect at 0:00 - as you can see in the video.
Would be nice if 1.16 releases with this annoying bug fixed.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-169965, which has been marked as Fixed for an upcoming version.
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