Cannot remove auto scheduling

[Eddasol]

Describe the bug
Cannot remove auto scheduling. It seems to be reset to null but when reloading it returns

To Reproduce
Steps to reproduce the behavior:

1. Go to a missionDefinitionPage
2. Set a autoSchedulingFrequency
3. Note how it doesn't change when reloading
4. Click the trash can
5. Note how the value disappear
6. Reload the page
7. Note how the value returns

Expected behavior

Screenshots