Don't work with inline_entity_form

I have tested using the clean drupal installation and it works with no issues.
Tried both: simply installed inline_entity_form and tried adding/editing entity there with autocomplete deluxe, after no luck with reproducing I have installed commerce and repeated you steps using both widgets from inline_entity_form module and both works as expected.
Perhaps it's some issue with your environment that removed access to autocomplete_deluxe's route which returns results, please make sure it is reproducible with clean drupal before creating an issue.
Also it's not possible for "order of js file" to influence Drupal's route access

Hi @rajab-natshah
this can be Closed (works as designed) as I was not able to reproduce any issues with clear drupal and commerce or simply with autocomplete element being inside inline entity form.

Thanks, Andrew, for following up
and thank you, Lawxen, for reporting.
Feel free to re-open or file a new issue if needed