Temporarily fixed this on the front end not to show the block number, so still needs to be fixed on the backend.
The effective inclusion time / inclusion delay also needs to be fixed as it is showing the expected inclusion time / inclusion delay for unshielded inclusion transactions
Additionally, the "submitted" status also doesn't show on the transaction page
A transaction with "Pending User Transaction" status shows a block number when it shouldn't. The behavior is not consistent though as shown below:
https://explorer.shutter.network/transaction-details/0x2e63ab759f3e14d53834b8e65b2186855996b0246956940893459b3f728f2bf4