tax-input-alternative.php

<?php
add_filter( 'tribe_events_community_sanitize_submission', function( $submission) {
	if ( empty( $_POST['tax_input'] ) ) {
		return $submission;
	}

	$submission['tax_input'] = array();

	foreach ( $_POST['tax_input'] as $taxonomy => $terms ) {
		$taxonomy = filter_var( $taxonomy, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH );
		$submission['tax_input'][ $taxonomy ] = implode( ',', array_map( 'intval', $terms ) );
	}

	return $submission;
} );