Weird failure condition yesterday.
DFW-YYZ-YHZ. 2 hour connection. I had some meetings that became important, so SDC to a later flight over the phone with the concierge[1]. On getting my BP reprinted the MLL agent asked the question about bags, answered it himself. Except, I did. The DFW contract agent did not actually check the bag all the way through.
So I had to leave airside, talk to a baggage agent, get escorted into the INTL claims room, move the bag across the border, and then re-clear security. Having done it before, and having the time, no biggie to me. But annoying AF.
Had I kept my initial connection, or not gotten a paper BP, my bag would still be in the INTL claims room.
[1] Unrelated gripe: SDC off a flight with several dozen on the standby list to a flight that took off with empty seats should not cost anyone $75.