The referenced entity (view: _none) does not exist

Thanks or flagging; I would like to help investigate, but I think I need clearer steps from a clean D11 'Standard' profile install how to reproduce including what specific settings you selected/didn't select. I expect there is some situation where there are no Block displays in Views causing the issue but needs more step by step (with screenshots if you think they might help)

I added some additional checks for now in the merge request here to check the Display ID selected exists since you flagged you left the display empty in 2 of your 3 fields but the error seems to indicate its related to the View itself not the Display, so this may not be helpful.

Hmm yeah that MR didn't work at all clearly; anyways will wait until we have more info

Glad to help. I was able to get it working by changing it to an unlimited field so that there is only one value by default and you must use the add more button.

I'm using the field in paragraphs with Layout Paragraphs and Paragraphs Editor Enhancements modules.

The viewsreference field is set to limited and 3 values.

Then adding that paragraph type on a new page gives an error if any of the fields are empty.

Hmmm I can't reproduce that with Manage Form Display -> "Views reference select list" widget:

I can see that the "Views reference select list" extends the Drupal Core Options Select Widget which specifically has code in validation to convert '_none' to empty https://git.drupalcode.org/project/drupal/-/blob/11.x/core/lib/Drupal/Co...

Are you maybe extending with your own field widget and overriding that validation in some way perhaps? Or perhaps some sort of form alter interfering with it?