Hi,
I got this same exact problem.
Another note is that when I tried to select more than 2 groups capabilities on the post, and then saved it, it doesn’t seem to be saving the value as the checkbox reverted to unchecked.
Any help would be appreciated.
Note: I am also using the paid version of Groups for Woocommerce plugin.
Thanks.
Wow.. that fix blew my mind. Thanks, @benjamin_r!