gnome-terminal 3.36, which is included in Ubuntu 20.04, added a config
option Preferences -> <profile> -> Command -> Preserve working
directory.

Older versions preserved the directory only when launching a shell, not
when launching a custom command. This behavior was frowned upon by some
folks, understandably.

The change is at https://gitlab.gnome.org/GNOME/gnome-
terminal/-/commit/79b2291 , the two bugtracker entries are linked from
the commit message.

Now, in order for this to work, two more things have to happen:
Whichever application (presumably your shell) is running in the source
window has to set the desired value, and whichever application is
starting up in the new window has to respect it (not intentionally
override it).

For setting: vte-2.91 is intended to do that, see its __vte_osc7()
method. Now there's a chance that some fragment in your shell profile
overrides it. To debug I recommend to manually issue the given escape
sequence and then not give back control to the shell, not to give it a
chance to override from PS1 or PROMPT_COMMAND or so:

  printf "\e]7;file:/etc\e\\" ; sleep 1000

A newly opened tab should be in /etc now. If this fixes the problem then
try it without the sleep. If that still fixes then your shell just
doesn't emit it. If removing the sleep breaks it again then there's
something in your prompt overriding the value.

To debug the other side: Set up a custom command of "sleep 2000", open a
new window, from another terminal locate the pid of this sleep, and
check its working directory at /proc/<pid>/cwd. If this is set
correctly, yet it doesn't work your shell or custom command, then it's
that command intentionally switching to some other directory.

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https://bugs.launchpad.net/bugs/1609342

Title:
  Gnome-terminal sets directory to HOME for ctrl-shift-n and custom
  shell command

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