Haven't come across this before.. when unlocking the car with the fob, just one of the rear indicators flashes, and both rear indicators work fine.
Hmm.. weird! anyone else had this?
(I replaced the hazard/indicator relay for a new one a few weeks back)
Hmmm.
Too bad all your indicators work, as if they didn't I would suggest it was your "new" Hazard switch/relay...
It may still be related, but I am not sure how/why.
I suggest you reach out to timmusand get his opinion.