This is a regression from 24w36a (where MC-207101 & MC-270183 were fixed).
The area effect cloud spawned by lingering potions no longer appears inside the entity, but above it. Due to this, the player doesn't get any effects unless they jump.
24w36a:
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24w37a:
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How to reproduce
Create a world.
Launch any lingering potion above you.
Notice how the area effect cloud has spawned above you.
Linked issues
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Can confirm in 25W18a.
MC-110648 and MC-200925 and MC-229483 may be related or may be duplicates.