No... I mean I haven't seen any cases of someone who had a "greyed out" legacy account that they were unable to send funds from, that disappeared after the updated their firmware and/or reset their device etc.

You are correct that Trezor doesn't "show" the list of Legacy accounts by default... but it shows the "Legacy Account" menu item and if you expand the menu item, it does show any existing "Legacy Accounts" with balance and transaction history. You don't have to explicitly go searching for them.


Unfortunately, what we're left with is that we're essentially "guessing" based on a 2nd hand description of something that happened 3-4 years ago.