Doesn't detect other activated theme patterns (only from the basetheme)

I am facing this issue too.

I'm getting same error but my scenario is little different.
I've a paragraph type, with mapping to a pattern.
I'm using layout paragraph, so it show the preview in edit mode also.
In the node add/edit I'm getting same error "Template not defined." as these page uses admin theme and pattern in define in default theme.

I tested this patch in couple of scenarios, it is working fine.

I can confirm this is working for me too.

I was getting this error as the Views preview was attempting to render nodes where a pattern was applied in the content type field display settings but that pattern was defined in the front-end theme.

I can confirm the patch is working for the 1.5 version. I had the error after upgrade the module and now is working well with the patch.

I needed to apply this patch along with the merge request diff from https://www.drupal.org/project/components/issues/3107993 🐛 Template is not defined error on admin pages when using administration theme Needs work for components to resolve the my error on the views admin page.

Ok, so let's wait 🐛 Template is not defined error on admin pages when using administration theme Needs work before merging

I performed a quick test this on UI pattern 2.0, and this is issue in not present in the v2.0.