New Item -> Error: File not found

Hello community

Some user message tho follow error to me if they add a item to a SharePoint custom list:

This error is showing after the user trys to save tho new item.

I can reproduce the error if I create a item as soon as the "+ New" button is showing.

When I wait until the list is loaded fully, the error won't displayed.

I claim that the error appears because not all values are loaded in the selection field yet. Can someone confirme the behaviour?

Details about the list: 

- 1125 entries

- 21 columns

- 5 choice types