When I explored the InlineEntityFormSimple class in the FieldWidget folder, I found an error where the IDE (in my case PhpStorm) shows a critical warning "Member has protected visibility" on lines 52 and 56. Look at the image in the attachments.
1. Open the InlineEntityFormSimple file, look at line 52 as an example, you will see a warning related to property visibility.
1. Just add the PhpStorm annotation.
2.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Thanks, I had almost forgotten about this issue. The patch is successfully installed and the IDE error is gone. Setting RTBC here.