How to reproduce:
1. Create a new project
2. Create a new object in a Scene
3. Switch the Tool Handle mode to Global and enable Grid Snapping
4. Open the drop-down menu for the Grid Snapping Settings
5. Make sure the current Grid Size values are Linked (Default should be 1;1;1 and Linked)
6. Change the X-Axis Size value (The only one which is enabled since the other ones are linked) and close the drop-down menu
7. Re-open the drop-down menu and observe the Grid Size values

Expected results: All Axis Size values are the same and equal to the value that was set on step no.6
Actual results: Only the X-Axis value is changed while the other Axes became Unlinked

Workaround: After changing the Size values and re-opening the Grid Snapping drop-down menu Link the Grid axis again. This should then correctly set the Grid Size for all Axes

Reproducible with: 2021.2.0a17, 2022.1.0a11
Not reproducible with: 2019.4.31f1, 2020.3.20f1, 2021.1.23f1, 2021.2.0a16(Grid Size and Snapping settings were in a separate window prior to the Overlays release)

Notes:
1. Tested on Mac OS 11.6.0 and Ubuntu 20.04