When a Stellar testnet reset occurs, all addresses and balances are cleared. Fireblocks automatically recreates your XLM_TEST addresses within 24-48 hours. However, your XLM_TEST balances are not maintained post-reset.
Additionally, the reset clears all your existing trustlines, and Fireblocks does not automatically re-establish your trustlines. If you opted into a trustline before the reset, you must create a new vault account and asset wallet, then opt into the trustline again using your new vault account and asset wallet.