There are three versions of the price test in ABConvert. To know more about it, please refer to this article.
If your product’s options are linked to Metafields, they cannot be tested using the Duplicate Variant version price test.
How to proceed
Non-Shopify Plus stores
Use the Duplicate Product price test version, which should work smoothly with your setup.
Shopify Plus stores
Contact us at support@abconvert.io, and we will help you switch to the Cart Transform price test version.