Editor table actions are not revertable

Steps to reproduce:

1. Install XWiki (17.10.3, also tested to happen in 17.10.2)
2. Open a page and edit it
3. Add a table
4. Use any of the following table actions: "Insert Row After", "Cell" -> "Merge Cells" or Column -> "Delete Columns"

Expected results:

I can click "Undo" to revert the change, for example reverting the merged cells.

Actual result:

I cannot undo the table action. "Undo" button stays gray.

If I write text to editor after my table action, I am able to click "Undo". If I do, it reverts both the added text and the table action that was made before.

Possible cause:

When I write text into editor, I can see a number of messages like this in the browser console:

[Saver]  Push local states: ...

When I do table actions, these messages do not appear. It seems that the editor is not recognizing that the table action has been made.