[Instructor Meta Box, Mine Post Table Filter] Default instructor information doesn't get saved with blocks

I was investigating an issue with the Mine(%d) filter on the posts table for course and membership post types and found
https://github.com/gocodebox/lifterlms/blob/master/includes/admin/post-types/post-tables/class.llms.admin.post.table.instructors.php#L106-L123

It expects all the instructors from the metadata and doesn't consider author information.

This led me to
https://github.com/gocodebox/lifterlms/blob/09c3353aaeb2a8785868f2cf1cf67c4146e94068/includes/models/model.llms.post.instructors.php#L118-L152

where the author was supposed to be added as an instructor. This is called via AJAX here:
https://github.com/gocodebox/lifterlms/blob/09c3353aaeb2a8785868f2cf1cf67c4146e94068/includes/class.llms.ajax.handler.php#L206

through
https://github.com/gocodebox/lifterlms/blob/09c3353aaeb2a8785868f2cf1cf67c4146e94068/includes/models/model.llms.post.instructors.php#L154-L174

Since the block editor experience removes the instructor metabox
https://github.com/gocodebox/lifterlms-blocks/blob/master/includes/class-llms-blocks.php#L135-L154

and handles it through the block editor, if instructor information isn't explicitly edited, the default author information doesn't get saved as that of an instructor, leading to the Mine filter to fail.