RPC node crash with "Too many sibling blocks inserted"

[mrq1911]

RPC node crashed after 32 imported blocks of the same height, node db was not recoverable and had to be reindexed

2 collators got stuck producing single block for 117 relay chains block, they tried 135 times before finally including block.

all the 117 paraInherent.enter extrinsics were without backedCandidates until last one, which one got finally backend and subsequently included, after that block production continued normally

collator logs (filtered): c2.log c1.log

westend galactic council (public testnet) basilisk 7.0.0 relaychain 0.9.17

[mrq1911]

it is related https://github.com/paritytech/cumulus/issues/432, this however should resolve only the import issue on RPC not a reason why collators failed to include block originally