I deployed the Gnosis Safe Guard example (https://github.com/safe-global/safe-contracts/blob/v1.3.0/contracts/examples/guards/DebugTransactionGuard.sol) on rinkeby network using remix.
Then I followed the official guide to add it to my gnosis wallet: https://help.gnosis-safe.io/en/articles/5496893-add-a-transaction-guard
After confirm the transaction on gnosis UI, it just fails with revoke message on the blockchain. No more clues. I'm wondering if there is an issue on the Gnosis app itself, or I'm missing something?
Details: My wallet created on rinkedby has balance and transaction was confirmed by the 2 owners.