Incompatibility when upgrading 1.20 -> 1.22

I am upgrading level db in a fork of https://github.com/Level/classic-level and when I start my application I get
`
[Error: Corruption: corrupted compressed block contents] {
code: 'LEVEL_CORRUPTION'
}
`
Are there any things to think about when upgrading leveldb?

Start by reproducing the startup failure while upgrading LevelDB from 1.20 to 1.22 in the reported fork of classic-level. Investigate the compressed-block corruption error and identify the upgrade compatibility requirement; the issue is resolved when the application opens its existing data without reporting LEVEL_CORRUPTION.

Written by the indexing model from the issue text.