The revision ID field is not flagged as revisionable, which might be a problem when iterating through the entity fields and retrieving only non-revisionable fields - e.g. when wanting to check if a non-revisionable field has changed. This has been detected in #2620980-106: ContentEntityStorageBase::loadRevision() should use the static and the persistent entity cache like ContentEntityStorageBase::load() → , where it caused problems.
Flag the revision ID field as revisionable.
Update the patch
Add tests
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I have closed 🐛 Revision id is not revisionable Closed: duplicate as a duplicate and adding credit.
This, and the duplicate, was discussed in #bugsmash with acbramley and catch. The issue summary does not describe a bug, only that there might be a problem when iterating through the fields to get non-revisionable fields. Therefore changing to a task.