Even when I move it outside the first class room, the bug still occurs, on both doors.
Do you have anything on the other side that might be triggering the problem?
Move the door out and try.
I solved this problem by creating a new invisible part for each door that has the click detector and welding it to the door, instead of clicking the gray door.
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notice the problem may be related to collision fidelity - which needs to be set to PreciseConvexDecomposition on the problematic part in order for both the ClickDetectors and ProximityPrompts to work seamlessly