
I thought it might have been just gnome-terminal, but I can confirm that it happens with all applications. I think it may have something to do with the top bar, because I can resize it to get it almost perfect on a secondary display, as opposed to my primary, where I can't resize it to center at all (without mouse drags, at least).

Are you guys sure it's not exactly in half? Try to align with e.g. a webam rather than the clock, since the clock is not necessarily in the exact middle of the panel.
I checked both of the screenshots posted here:
@WatchMkr Yours is split in the middle exactly, both the left column and the right column are the exact same width.
@leviport Yours are different, but it appears that may be due to the terminal not being able to resize to any arbitrary pixel size. It's limited to sizes which perfectly fit an integer-number of characters in width.
We're talking about horizontal halfness. Check out the red lines I doodled on my screenshot. They're supposed to show the height difference between two Nautilus windows.
Ah, yep. Just noticed that myself
This is still happening for me.
pop-shell:
Installed: 0.1.0~1585606052~20.04~8fb4de7
Candidate: 0.1.0~1585606052~20.04~8fb4de7
Version table:
*** 0.1.0~1585606052~20.04~8fb4de7 1001
1001 http://ppa.launchpad.net/system76/pop/ubuntu focal/main amd64 Packages
1001 http://ppa.launchpad.net/system76/pop/ubuntu focal/main i386 Packages
100 /var/lib/dpkg/status

See if f40419d fixes it
See if f40419d fixes it
It seems to work for me
Looks good!