It is possible to request an override that ends in the past

[ZLLentz]

Note these currently active overrides, where the start time is on the 26th and the end times are earlier in the month

[ZLLentz]

Looks like this on the PLC side:

[ZLLentz]

8678990 milliseconds remaining = 144.65 minutes, so these are probably handled correctly internally with some edge case that breaks the Expiration value that the screen is looking it.

[ZLLentz]

Also, these look very close to 24 hour bypasses