I setup Trezor 1 (not Model T) with Electrum, then created a receiving address in Electrum (not Trezor's wallet). I then sent transfer from Paxos account to this address. However, Paxos triggered some confirmation of transaction, and Trezor+Electrum had a 5 min time out. I had to disconnect Trezor and fire Electrum back up. I don't see transaction history in Electrum or the receiving address referenced anywhere. Now what?
Electrum generates addresses deterministically. That means that the first address it generates based on your seed will always be the same as long as it is unused. As soon as Electrum sees a transaction on that address (regardless of whether it has been confirmed or not), it will never again generate that receive address.
As to why the transaction was not show in your history in Electrum: this is due to Paxos not immediately processing the actual Bitcoin transaction as soon as you confirm your withdrawal.