Backport #18381 to 20.8: Restrict merges from wide to compact parts #18514
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Original pull-request #18381
Cherry-pick pull-request #18512
This pull-request is a last step of an automated backporting.
Treat it as a standard pull-request: look at the checks and resolve conflicts.
Merge it only if you intend to backport changes to the target branch, otherwise just close it.