When adding events in IC5, if you add them via the "Add Similar Event" feature, it removes the cover image upload field when adding the new event, and also if you try to edit the event after posting it. You can still add and adjust a cover image via the Cover Image drop-down on the display page after it is posted.

This affects both my cloud communities and self-hosted communities running the latest IC5.

Adding an event normally appears to be working as intended, and has the cover image upload field when first posting and also when editing.

Thank you for bringing this issue to our attention! I can confirm this should be further reviewed and I have logged an internal bug report for our development team to investigate and address as necessary, in a future maintenance release.