I spent some time today and upgraded to 2019 R3 to see if that made a difference for me.  It picked up the shared topology for the blind hole, but I still couldn't get all of the partitions to mesh.  I must have some settings different that's causing it not to work like yours.  Then I attempted the additional slice you recommended.  With the exception of a couple of partitions that I think I can probably fix, everything meshed just fine except for the highlighted area below.  It didn't want to mesh even if I started there.