How did you update? Updating bisq has never made users lose funds.
Bisq data and user data is separated.
Make sure the wallet is up to date (not synchronizing).
Having a backup and wallet seed will make you feel better in cases like this.
Make backups of what you have now. This is how to restore from a backup. You’ll lose the trading data since the time of the backup, but get the wallet and old trade data.