In creative mode, the status effect bars cause the player's whole inventory screen to become centered in the same way that it does when the recipe book is open.
The off-centering persists when the effect times out until the inventory is closed, when it can be re-opened and is normal again.
The bug does not affect survival, adventure, or spectator mode.
Linked issues
is duplicated by 3
MC-196798
When the effect timer ends, the creative inventory won't move to the left until reopening the inventory
Resolved
MC-204064
When in creative mode, the inventory GUI does not return to the center of the screen once a potion effect has expired.
Resolved
MC-224573
Creative inventory is offcenter with potion effects
Resolved
Can confirm for 1.16.2