QGIS » QGIS Application

I came across this trying to trigger checkbox states based on other checkbox states with case->when default values to behave similar to radio buttons. No luck there, but came across this.

1. Start new project
2. Add new scratch layer, no geometry
3. Add an integer field and save
4. In Attributes Form, select the field. Change Widget Type to Checkbox. Set checked state to 1, unchecked to 0. Apply. OK.
5. Re-open properties. Select the field. In default values, enter 1 (to default to checked state). Apply. OK.
6. Re-open properties. Select the field. CHECKED STATE OPTIONS ARE GONE!
7. Clear the default value. Apply. OK.
8. Re-open properties. Select the field. Checked state options return, but empty.
9. Could be there's a reasonable explanation for this?

Thanks!
BTW, originally added this to #18075 but I'm not sure that is watched.