Is there a chance that maybe you've deposited your coins in the past on addresses starting with 1 and now your (recovered?) wallet has addresses starting with bc1? (if you don't know, the year could be a clue)
Maybe it's not about the hidden feature, if you've never used it?
I don't think that's ever been suggested before, not even on the Trezor forums! That's very interesting. I'm basing off of the TX IDs I have from the hot wallet I was using to transfer funds from, and the receiving addresses all start with bc1q. So, I guess that means it's really the hidden feature?