Some important events for coordinating flights in Google Calendar are not displaying in Proton Calendar views.

The events show up when I use the Proton Calendar search box, but the day, week, and month views hide them.

This appears to be a glitch due to the fact that the suggested workflow to import Google data to Proton fails to keep calendar data continuously synced with Google. Would like to disable Google Calendar, Google Contacts, etc. default in those workflows. Present a warning banner that these are one-time syncs, not continuous syncs. Because an ICS subscription is more reliable than one-time syncs.

Update: Newly creates Google events fail to appear in Proton when synced via Google ICS subscription. For comparison, Google and iCloud show the events.