Issues with Advanced Date Filters

We have suddenly seen issues with Advanced Date filters in Looker since last night.

The filter is prepopulated to compare two dates with an or clause -

Users should be able to select 2 dates to compare with, but when they open one of the date selectors > Select a different date and save

That date just disappears leaving only one

This is how the filter is set up

I have a feeling this is a Looker Platform issue as last night our instance was upgraded to 25.0.18 and the issue only arose since.

Has anyone else got this issue, is there a solution?