Element autocomplete does not validate against list of options

Can you add a test for this?

I'm afraid I tried the patch
https://git.drupalcode.org/issue/webform-3463864/-/commit/a527618b7181cb...
based on the changes and it failed.

The issue is that it is taking the input $value (a textual string eg 'location1 from my custom options') and then looking in a keyed array $options[$value] eg $options['location1 from my custom options'] which doesn't exist. It should be eg $options[1] etc.

So while it prevents the form from submitting if a bad value is entered, it also prevents the form from submitting if a valid option is chosen.