> Update CheckBlockIndex invariants for chains based on an assumeutxo snapshot
https://github.com/bitcoin/bitcoin/pull/27746/commits/272fbc370c4e133d31d9f1d34e327cc265c5fad2
> test: Clear block index flags when testing snapshots
>
> When simulating a snapshot, remove the HAVE_DATA status for blocks below the
> snapshot height, to simulate never having downloaded them at all. This makes
> tests more realistic (and more closely match what will happen when using
> assumeutxo).
https://github.com/bitcoin/bitcoin/pull/27746/commits/3cfc75366e6596942cbc84f354f42dfd7fc5c073
This is a partial backport of core#27746