C7 v2.5.0.136
I turn on the Required Expression toggle, click Define Required Expression, choose my presence device, and choose not present:
After I click Done, the Required Expression I defined is not displayed:
If I click back in and attempt to edit, it's broken:
It appears clicking the Done with Required Expression button causes the error. If I click Done with Expression and back all the way out one screen at a time, then the expression is retained and not broken.