Initially, I added the same product attribute twice by mistake. Realizing this, I deleted one of them. However, I forgot to unlink the attribute from one of the product types before deleting it. Now, this deleted attribute still appears as an empty selection box on the 'Add Product' page.
I've tried clearing the cache and running cron, but neither resolved the issue. Could this be a bug, or is there a specific workaround that I should try?
Closed: won't fix
2.39
Developer experience
I realized that I left a residual configuration in the system. Although not ideal, I manually deleted the field from the product type page, which was a practical solution in this scenario.
Absolutely, I'm glad I found a solution, at least it will help others that come across.