Hello,
We have fixed the SKU search.
Also, we found that Ajax Search is not compatible with WooCommerce Wallet. Your plugin WooCommerce Wallet has problems with get_price_html() function, this function gives the error that causes problems with Ajax Search. So, contact the plugin author to fix the problem with get_price_html() function. Meanwhile, either disable plugin or disable Ajax Search.
Unfortunately, we don’t have snippets for the tags and attributes search. Then look for additional search plugin with advanced options.
Check the top bar now. Is it ok for you?
Regards