Renaming a tree of pages that contain classes does not succeed although all pages with classes are selected to be moved.

When moving a page tree (or possible single page, didn't test that) that contains an XClass there is a warning the you are about to rename a page that has a Xclass.

Selecting all of them will result in pages with XClasses not be be moved. The message in the operation log is:

Skipping [page] because it has been unselcted

which is not the case as of the above, all were selected.

Firefox 94.0.2 on Windows

This will leave the tree to be partially renamed/moved, except the pages that had an XClass defined.