Uncaught Error: Syntax error, unrecognized expression: #

When I click on expand paragraph in an edit form, errors like this are shown in the console:

Uncaught Error: Syntax error, unrecognized expression: #
    at I.error (jquery.min.js?v=3.7.1:2:11769)
    at Y (jquery.min.js?v=3.7.1:2:17234)
    at re (jquery.min.js?v=3.7.1:2:20008)
    at Function.I [as find] (jquery.min.js?v=3.7.1:2:7520)
    at ce.fn.init.find (jquery.min.js?v=3.7.1:2:21991)
    at new ce.fn.init (jquery.min.js?v=3.7.1:2:22483)
    at ce (jquery.min.js?v=3.7.1:2:1077)
    at loadAjaxBehavior (ajax.js?v=10.3.8:44:29)
    at Array.forEach (<anonymous>)
    at Object.attach (ajax.js?v=10.3.8:52:40)

Then If I delete a file from a field also shows the same error in the console, and then Javascript doesn't work, when I click on fold paragraph the page refreshes.

This is the call in ajax.js where the error is triggered:

// Load all Ajax behaviors specified in the settings.
Object.keys(settings.ajax || {}).forEach(loadAjaxBehavior);

And then:

once('drupal-ajax', $(elementSettings.selector)).forEach((el) => {

Any ideas?