When importing products with CSV searching for one of the products created by the import by name works, but searching for the SKU returns nothing. This is true both in admin and the storefront (using a search plugin that can search by SKU).
The created products are also visible at the top of the product list, and it lists the SKU correctly.
If a product is updated (going into edit or quick edit and just clicking update) it is then searchable by SKU both in admin and the store.
If a product is created manually and then updated with import this is not an issue.