Output CSV for instead of line break (<br/>) for job_category with WP Job Manager Field Editor

functions.php

<?php
//
//	CUSTOM FILTER TO ADD COMMA AFTER TAXONOMY OUTPUT FOR FIELD EDITOR
//
//

add_filter( 'field_editor_output_no_wrap_after', 'smyles_output_csv_for_job_category', 10, 6 );

function smyles_output_csv_for_job_category( $separator, $field_slug, $job_id, $field_values, $args, $single_value ){

	// ADD ANY ADDITIONAL META KEYS TO USE WITH COMMAS BELOW
	$csv_meta_keys = array( 'job_category' );
	
	// If meta key is not one of our meta keys from above, return the default separator
	if( ! in_array( $field_slug, $csv_meta_keys ) ) return $separator;

	$last_value = end( array_values($field_values) );
	
	// Only output comma with space for values that are NOT the last value
	if( ! empty( $single_value ) && $last_value !== $single_value ) {
		return ', ';
	} else {
		return '';
	}

}

Value Wrapper and Full Wrapper must be disabled for this to work, which is the case by default, so unless you specifically enabled them, you do not need to worry about it.

Other examples:
https://gist.github.com/tripflex/7fa23b6250d74609b8a8
https://gist.github.com/tripflex/cf5e51a0e9342535038926afce9498b5