'Is enabled' Notifications Custom filter doesn't keep it's value after page refresh

Steps to reproduce

1. Login
2. Go to Notifications Settings
3. Add some filters on the 'Custom Filters' section by watching some pages (which will have the 'Is enabled?' toggle set to ON)
4. On 'Is enabled?' column, click on the filter box drop-down and select 'False'
5. Refresh the page
6. Observe the value of the 'Is enabled?' drop-down filter box

Expected results

The value of the 'Is enabled?' drop-down filter is kept after page refresh (e.g. 'False').

Actual results

The 'Is enabled?' drop-down filter doesn't display anything after page refresh.

Since the existing filters had the 'Is enabled?' toggle set to ON, the LD is empty, which is confusing.