Impossible to produce blocks with `forkchoiceUpdated`
`master` and https://github.com/status-im/nimbus-eth1/pull/2423 have the same issue

If it already knows about the block:
https://github.com/status-im/nimbus-eth1/blob/0723464928517741bf75440d3bdc6c1644849703/nimbus/beacon/api_handler/api_forkchoice.nim#L154-L163

then it returns and never processes the payload attributes to trigger payload generation later on in that function:
https://github.com/status-im/nimbus-eth1/blob/0723464928517741bf75440d3bdc6c1644849703/nimbus/beacon/api_handler/api_forkchoice.nim#L189-L210