Why not all the SKU number can be search by the search bar?

Urna Theme
#1

I just updated to the latest WordPress 6.8.3 and HUSKY - Products Filter Professional for WooCommerce v.3.3.7.2

When I search using the product search bar, some of the SKU number show “No products found.” Instead, i do have this SKU product created. The product title and content working fine on search but the SKU number, some products cannot find but some can find.

Any idea?