"Add existing node" autocomplete broken since Drupal 7.73 update

In one of our client's websites, we use the Inline Entity Form to create new and add exisiting "related" nodes.

From we've updated Drupal to 7.73 last friday, an error occures when we want to search for existing nodes. A screenshot for the error has been attached, which says there's a "parsererror".

I did some research and found out the autocomplete.js has been updated since the last Drupal core release: https://github.com/drupal/drupal/commit/cd3721550d988240ef6e682bd1cae293....
The related "ticket", with some more information, can be found here: https://www.drupal.org/sa-core-2020-007 → .

I could fix the issue by remove the newly added jsonp: false, from misc/autocomplete.json, but of course that's not a proper solution. I think in the Inline Entity Form module this value must be "overridden" and set to true, as mentioned in https://www.drupal.org/sa-core-2020-007 → .