TYPO3 Core

When creating user groups, the "Files" and "Directory" settings under "Mounts and Workspaces" are not saved correctly, when no checkboxes are selected.
Also, "Revert Selection" does not do anything.

Steps to reproduce:
1. Create a user group
2. Under "Mounts and Workspaces" goto "Directory"
3. Click "Toggle all" twice, so no checkbox is selected
4. Save
--- List should be empty now
5. Check "Toggle all" under "Files" twice, so no checkbox is selected
6. Save

Result:
The checkboxes in "Directory" and "Files" have their initial configuration again.
This does not happen, when "Files" and "Directory" have at least on checkbox selected.

Further observations:
"Revert Selection" does not work (Andreas Fernandez confirmed on Slack, that it should work in current master, my tests are on 9.5.5)
The "Toggle All" functionality works as expected with all the "Modules" and "Tables (listing)" under "Access".

Tested on
TYPO3 8.7.24 "classic", php 7.2
TYPO3 9.5.5 "classic", php 7.2

Might be related to