stvclanton

I am using the “Redirection” plugin to add the post_type=<post_type> to the url and passthrough. Thus, you go to https://example.com/my-custom-type/ and see https://example.com/?post_type=my-custom-type by passthrough.
So instead of saying aggregated page, I should say more specifically that https://example.com/?post_type=first-type was displaying https://example.com/?post_type=second-type while https://example.com/?post_type=second-type was displaying 0 posts.

It is working. I would guess the problem was with having two custom types that were nearly identical. I would guess that it has something to do with how identical field names are normalized. In my case, I have all identical fields, but rather than the fields being renamed as the upgrade guide would suggest, the second content type seemed to become a copy of the first.
When I first encountered the problem, my second custom type did not work. I would to pages that aggregated my first type, and they would work correctly. However, the second content type didn’t work at all. I went in to the second content type in admin and saved it without looking at it, figuring that would fix it. However, the second custom type kind of replaced the first. The pages that aggregated my first content type displayed the posts of my second content type, while the pages that aggregated the second content type still didn’t work.
I basically just had to recreate the second content type, and then everything worked.
Thanks for the plugin, by the way. Let me know if I can help you track the bug down.