Hello,
I apologize for the inconvenience you are facing with the missing Price specification @type in the schema of some products. This issue might be occurring due to the schema markup not being correctly configured for those specific products.
To resolve this problem, you can ensure that the Price specification @type is set to PriceSpecification for each affected product. You can do this by checking the schema markup settings for those products in your WooCommerce settings.
If you need further assistance or have any other questions, please feel free to provide more details or screenshots, and we will be happy to help you resolve this issue.
Thank you for reaching out with your concern.
Sources:
Google Search Console Missing Field Warning » Rank Math
How to Use Product Schema for WooCommerce Products » Rank Math
Product Schema Type » Rank Math
Hello,
The type is present when checking the URL with the Schema Validator and Rich Results Test: https://search.google.com/test/rich-results/result/r%2Fproduct?id=de-_EL3SWTDcmynIyixr2A

You can ignore the error you are getting from the tool you are using, as the Schema is validating fine for Google.
Please do not hesitate to let us know if you need our assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.