Processing multiple revisions doesn't save them all

Problem/Motivation

When content moderation is enabled and the tidy process updates multiple revisions for an entity, not all are saved.

Steps to reproduce

Create a page with an item for tidy to update, save it as 'Published', update the item to create a 'Draft'.

Run tidy on the page twice. (they second run should not have any updates listed)

Proposed resolution

Fix the issue :)

Test steps

Create a new page with an item that tidy will update (for example, create another page and give it a url alias and use that)

<p><a href="/test/page">test</a></p>

Run tidy on the node twice
drush link_magician:tidy nodeid --nodeid={NN}
The second run should not list any updates (and the changes are saved now!)