BlockchainTree unexpectedly reverts blocks

[rakita]

Describe the bug

It is reported a few times, but Tree receives two FCU and unexpectedly reverts 36 blocks on the second one.

Panic on unwinding is separate issue.

The flow goes something like:

1. Pipeline finished
2. FCU with 0xe9 head
3. New Payload 0x2a
4. FCU with 0x2a head

Steps to reproduce

Happens on the tip.

Node logs

No response

Platform(s)

No response

What version/commit are you on?

No response

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