NewPayload spam for slots with invalid blocks

Whilst testing hoodi validators I noticed when the validator recieves an invalid slot (produced by someone else) the recieving nodes (running with caplin) get hit by 100's of `NewPayload` requests for the same invaid block.

For example for slot 1528620: https://dora.hoodi.ethpandaops.io/slot/0x1f943ee6d7b4abcded0a66380164da15dff28836bf9f871a8736fd08bbbbafae

This is the summary log of slot related requests:

[slot-1528620-summary.log](https://github.com/user-attachments/files/22950172/slot-1528620-summary.log)

This is the full log of all processing for that slot:

[slot-1528620.log](https://github.com/user-attachments/files/22950179/slot-1528620.log)