See [this post on /r/Stellar](https://np.reddit.com/r/stellar/comments/rcn0uh) and my comments there. TL;DR: It seems to be an issue with Trezor after recent firmware and Trezor-connect updates that has completely broken support for Stellar. They seem to be aware of it. They better fix it soon; users losing complete access to their funds is a complete disaster and the opposite of better security. I’m starting to think it would be better to ditch Trezor for good.