Max Relations validation on multi site setup

[belkin]

I've created Calendar Events field with Max Relations set to 1. But after adding it to entry type and choosing an event from the calendar plugin I'm getting following validation message/error: Events should contain at most 1 selection. If I remove Max Relations from the field everything works as expected.

Steps to reproduce

1. Create multi-site setup. In my setup it was with 3 languages (EN/NL/FR).
2. Create new Calendar Events field
3. Set Max Relations to 1

4. Add to Entry type
5. Select Event
6. You should see following error message Events should contain at most 1 selection.

Expected behavior

1. To be able to set Max Relations without errors on Entry save

Craft & Plugin Info (please complete the following information):

• Craft Version: 4.7.4
• Calendar Version: 5.0.3
• Calendar Edition: Lite
• Fresh Install or Upgrade: Fresh Install

Additional context

Everything on Advanced section are unchecked.