I think it's like this (line numbers added)

bad:

line 423: [ply-boot-server.c:388]             
print_connection_process_identity:connection is from pid 677 (/bin/plymouth 
deactivate) with parent pid 668 (/usr/sbin/gdm3)
line 498: [./plugin.c:649]                                      activate:taking 
master and scanning out

good:

line 402: [./plugin.c:649]                                      activate:taking 
master and scanning out
line 573: [ply-boot-server.c:388]             
print_connection_process_identity:connection is from pid 711 (/bin/plymouth 
deactivate) with parent pid 665 (/usr/sbin/gdm3)
line 583: [./plugin.c:679]                                    
deactivate:dropping master

In the bad case, we don't see "dropping master" because boot_splash is
NULL, because we were already deactivated.

I asked upstream about the attached patch, will see what they say and in
the meantime it's on
https://launchpad.net/~laney/+archive/ubuntu/plymouth if somebody would
care to test.

** Patch added: 
"0001-Don-t-show-default-splash-if-we-are-already-inactive.patch"
   
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1795637/+attachment/5199439/+files/0001-Don-t-show-default-splash-if-we-are-already-inactive.patch

** Changed in: plymouth (Ubuntu Cosmic)
       Status: New => Triaged

** Changed in: plymouth (Ubuntu Cosmic)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1795637

Title:
  No login screen when booting Cosmic

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