@stormymondays The Autogenerate Descriptions setting was deprecated in v4.x, but some users may see it if they had it set to Disabled in v3.x. When that happens, you will see #description where you had no set meta description.
The notice we displayed was never a bug. We displayed it because there were some edge cases where users would set a title and meta description in the General Settings of AIOSEO v3.x and then change the Use static front page instead setting which hid those two fields. They might then assume that AIOSEO was autogenerating their SEO meta for their homepage which was not the case. This is why we displayed a notice in v4.x recommending these users double check what was set on their homepage to ensure it matched what they previously set in v3.x. Again, this was a very edge case where some users inadvertently hid the Home Page Settings fields.
All reported issues with the data migration have been fixed in previous releases. We’re not aware of any open issues regarding data migration.
It’ll depend on whether your homepage is set as a static page or set to display latest posts as to where that data is migrated to.
If you have a static page then the SEO meta is migrated from the wp_postmeta table to the aioseo_posts table but we keep the old data intact so you can 1). downgrade and still have all your SEO meta there, and 2). so we can use the old data if the migration is in progress or is incomplete.
If your homepage is set to display latest posts then the data is store in the wp_options table.
It’s therefore easy enough to check if the data is the same in both places.