I've watched TA participants 'debate' and 'advise' on this topic fairly regularly and over many years...in all those years I've only seen one or two people that have given first hand experiences.
I've had a passport that was to expire within days of returning to my birth/passport issuing country. The airline was concerned at first and told me they could deny my flight...they quickly made a phone call to the appropriate people and the airline was told that I was okay to fly to Jamaica. There is no six month passport rule within Jamaica.
Now, having shared my experience...as you can see...it
can be decided by the airlines whether you get on that particular flight you've booked...if you don't want to be dealing with an airline that may or may not know whether the six month rule applies...you should choose to avoid the scenario by getting a more up-to-date passport.