CLN not properly detecting confirmed transactions

[yaslama]

Issue and Steps to Reproduce

From time to time some utxos are not detected by CLN and we have to restart CLN with rescan=n (with n at least few hundreds) to recover the utxos of the last few days. It's very hard to mitigate the issue, because rescan is very slow (few seconds per block) and we don't really know if transactions confirmed in older blocks were missed. In fact there are two issues:

1. UTXOS are not detected
2. CLN cannot make any transaction until the rescan is finished.