In the Import/Export > Product Specifications, Catalog allows importing an array of values in Number-type product specifications.

This causes a blank/empty field in the specification of the product page.

Simulation

1. Import a specification value in array format.
2. After importing, go to the product form page that imported the specification.
3. Scroll down the form to the specification imported.
4. The specification field is displayed as blank/empty.

Workaround

Update/import the specification with a new unique value.