Hi,
Saving the project in an iCloud folder was the missing link. Although I have not had an issue with renaming events, any events created in a project hosted in an iCloud folder are not saving.
Thank you for bringing this to our attention and helping me find the issue. I will pass it onto our development team to look into further. For the time being, I would suggest saving the project outside of an iCloud folder. Once there are updates I will post them here.