Randomly returns 404 for the single post

Hi, I'm running into some issues which appear to be related to the plugin somehow.
When I enable a page to be the archive for a post type, sometimes the single view for that post type starts responding with 404.

What's puzzling is that this does not happen consistently for all post types, and it isn't consistent either from local to server installs.

Have you seen a similar behaviour before? Any workaround?

Start by reproducing the 404 with a page configured as a post-type archive, comparing post types and local versus server installs. Investigate the plugin's post-type archive and single-view behavior; done means single post views resolve reliably without intermittent 404 responses.

Written by the indexing model from the issue text.