Thanks for the response - I only received a 1099-SA from the original HSA bank, and 5498-SA from the new HSA bank. Neither form includes the transfer amount, which is interesting.
I called both HSA banks today, and they mentioned that if you contribute to to an HSA in 2019 and then do a trustee-to-trustee transfer, the amount contributed in 2019 from the original bank/HSA does indeed count towards the annual maximum limit (but the rest of the transfer does not). Which I guess makes sense, as that's similar to a 401k roll over, and if not would be a major potential loop-hole.
Looks like I need to research how to handle excess HSA contributions.
