We have a problem with the auto generated slug for rootpages in the new routing of TYPO3 9.5.4.

this is the domain setup:

* configs (not marked as rootpage, stores config files)
* domain A (flagged as rootpage, has a siteconfig, has subpages)
* domain B (flagged as rootpage, has a siteconfig, has subpages)
* domain C (flagged as rootpage, has a siteconfig, has subpages)

All domains have the slug `/` which works for a while, but after a while some slugs change to `/1` for no reason, and we're unable to change that via the backend. The only possible solution is to change the slug in the db directly.

Is anyone experiencing the same behavior, is there some configuration missing or am I just doing something wrong?