How can I fix iCal sync issues with iCloud?

For the last month or two I have noticed this on and off behavior. I will update and entry in iCal on my Mac and then reopen it later and find the changes I made gone. If I look in the cloud though I see that those earlier changes are there.

Mac Mini Sequoia 15.5

[Re-Titled by Moderator]

Original Title: ical synchs to cloud but not in Mac app