WooCommerce: Webhook disabled on its own

If you don’t want to fix this every time WooCommerce updates, just create a filter in your child-theme:

function overrule_webhook_disable_limit( $number ) {
    return 999999999999; //very high number hopefully you'll never reach.
}
add_filter( 'woocommerce_max_webhook_delivery_failures', 'overrule_webhook_disable_limit' );