My car dome halogen light stays on despite close door and despite lock car

Summary of current situation:

After resolving an electrical back-feed issue related to an aftermarket fog-light relay (replaced with a Bosch relay, issue fully resolved), a separate interior light issue remains.

Current dome light behavior:
• Switch OFF → dome light OFF (normal)
• Switch ON → dome light ON (normal)
• Switch AUTO (door) → dome light stays ON continuously, even with all doors closed, engine OFF, and vehicle locked

Important observations:
• No abnormal dash behavior
• No parking or exterior light flicker
• Door ajar status shows correctly on the dash
• BCM functions normally and can turn the dome light OFF via the OFF position
• Issue is isolated only to AUTO mode

Idont know what is the cause,
could be faulty AUTO switch/contact inside the dome light assembly (housing)?

Request:
• can you please tell me what are the possible causes? And do you agree with me it could be a faulty dome switch or other things?
. What are the diagnostic steps you recommend to find out what is going on.

Thanx