Master has moved far enough away from the 2.2.x branch is is probably better to backport the tests as well.

This may be a bit naive, but I'd say one should always backport the tests. Even with tests it's still possible to break things unconsciously, but at least it ensures not to break the very feature that is added.
With fewer and fewer users actively using the 2.2 branch it's also more likely that if something breaks it will not immediately be discovered.

If this gets backported to 2.2 then#12673 should as well, right?

Oh, good catch@ImportanceOfBeingErnest !

I miss-read things, I am -0.5 on backporting these PRs as they are not critical bugs in 2.2.x

Fine with not backporting.