Issue with filter widget not showing up

Hi,

I’m trying to add a widget filter (either the Woodmart Layered Filter or the “Filter Products by Attribute” widget) to my shop page. However, when I attempted to do this, I received the following error:

There was an error. Cannot read properties of undefined (reading ‘hasOwnProperty’)

I looked into similar issues and found suggestions to install the Classic Widgets plugin, which I have done. Now, I can add the filters without any error messages appearing, but unfortunately, the filters are still not visible on the shop page.
Please see the attached screenshot for reference.
Could you help me resolve this? I already have color attributes set up in the Attributes section.
Thank you