Hi,
I think you need to stop to worry about it. I have pass a dozen of Xray Check point and a box of roll in my bag. Then i kept my bag with me during all my job in my car (3 weeks) That means something like 30 degree during the day (east african project).
I came back through xray again, developped at home and it was all ok 🙂
I never had any problem, perhaps i am lucky i don't know. But, i think, you need to stop to worry and burn your film.
The theory of an urban legend could be possible IMO. Photographers of all the times seems to be very protective and anxious about there materials and tools ! It's all a kind of fetischism (i admit i am fetiscist too)
Good day