subscribeFinalizedHeads doesn't return all the finalised header

[KarishmaBothara]

We relay on subscribeFinalizedHead and listen to all the events in the header to check for authority set change event in case of validator relayer. After checking cloud watch for last two days, noticed that finalised head did not subscribe for block number between 12870475 to 12870659. From uncover end point found out that, authority set event occurred at block number 12870481

Had to manually submit the proof for proof id 305 and 306.
On polkadot js, there is a issue for api does not return all the blocks for subscribe new head
polkadot-js/api#1744
On substrate there is this one - paritytech/substrate#4738

Need to look at way to modify the validator relayer to not relay one subscribeFinalizedHead