[Bug 272751] ports-mgmt/pkg Conflict detection has gone missing in 1.20.4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272751

            Bug ID: 272751
           Summary: ports-mgmt/pkg Conflict detection has gone missing in
                    1.20.4
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: pkg@FreeBSD.org
          Reporter: jeroen.pulles@gmail.com
          Assignee: pkg@FreeBSD.org
             Flags: maintainer-feedback?(pkg@FreeBSD.org)

On pkg 1.20.4 there doesn't seem to the usual run of things when you want to
install a package that conflicts with an existing package. 

It seems the installation of the new package just takes place, there is no
mention of REMOVED the old package; And in the end pkg is saying it is doing
some things with the conflicting package. See below where postgresql14-client
seems to get the last "install". Nonetheless, the files on disk seem to be from
postgresql15-client. 

The example below is from postgresql client and server, but I'm also seeing
this with other packages that have CONFLICTS_INSTALL in their port. 

This is a snippet from an upgrade in a jail that has pkg 1.20.4:

[...]

Checking integrity... done (1 conflicting)                                      
  - postgresql15-client-15.3 conflicts with postgresql14-client-14.8 on
/usr/local/bin/clusterdb                                                        
Checking integrity... done (0 conflicting)                                      
Conflicts with the existing packages have been found.                           
One more solver iteration is needed to resolve them.                            
The following 6 package(s) will be affected (of 0 checked):                     

New packages to be INSTALLED:                                                   
        postgresql15-client: 15.3                                               

Installed packages to be UPGRADED:                                              
        py311-phonenumberslite: 8.13.16 -> 8.13.17                              
        py311-urllib3: 2.0.3,1 -> 2.0.4,1                                       

Installed packages to be REINSTALLED:                                           
        py311-psycopg2-2.9.6 (direct dependency changed: postgresql15-client)   

Number of packages to be installed: 1                                           
Number of packages to be upgraded: 2                                            
Number of packages to be reinstalled: 1                                         

The process will require 10 MiB more space.                                     

Proceed with this action? [y/N]: y
[xxx] Fetching postgresql14-client-14.8.pkg: 100%    2 MiB   2.5MB/s    00:01   
[xxx] [1/6] Deinstalling postgresql14-client-14.8...
[xxx] [1/6] Deleting files for postgresql14-client-14.8: 100%
[xxx] [2/6] Installing postgresql15-client-15.3...
[xxx] [2/6] Extracting postgresql15-client-15.3: 100%
[xxx] [2/6] Installing postgresql14-client-14.8...
pkg: postgresql14-client-14.8 conflicts with postgresql15-client-15.3 (installs
files into the same place).  Problematic file: /usr/local/bin/clusterdb


On pkg 1.19.2:

[...]

Installed packages to be REMOVED:
        postgresql14-client: 14.8
        postgresql14-contrib: 14.8
        postgresql14-server: 14.8

New packages to be INSTALLED:
        postgresql15-client: 15.3
        postgresql15-server: 15.3

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