On Fri, 5 Jun 2020 at 04:57, Tom Lane <tgl@sss.pgh.pa.us> wrote:

 Reproduced here. The example works in v11, and in v10 if you remove
 the unnecessary-to-the-example primary key, so it seems like a clear
 regression. I didn't dig for the cause but I suppose it's related
 to Andres' slot-related changes.

Looks like c2fe139c20 is the breaking commit.

David