Newly created schedules not listed

Hi there,

I see this plugin is incompatible with WP 5.5.1, although there are no problems with the install.

After adding a new schedule for example:

Label: Once every 3 minutes for HubSpot deals sync
Slug: mwb-hubwoo-deals-5min
Interval: 3 minutes

The newly created schedule is not listed under the list of available schedules, i.e. only the default WP schedules are listed – every minute, every 5 minutes etc.

Then I purposefully try to add another schedule with the same name/slug etc – it throws an error “Schedule Once every 3 minutes for HubSpot deals sync already exists” but the newly created schedule is still not listed.

Thanks in advance