resize-pane -x not working as expected in a script (though it works properly when input manually)

[mmlvx]

I apologize if this is the wrong place to ask; and I thank you for tmux, which I have been using for 3 or 4 years - wish I'd started sooner.

Using Windows 10 - WSL2 - Ubuntu - bash. I have a layout of 6 panes that I use often, so I put it in a bash script to launch with a short command. I use this on a monitor I have rotated to "portrait mode" -- echo $LINES says it is 89 lines tall (in tmux, it says 88 because one line at the bottom is for the status) and echo $COLUMNS returns 104 columns wide. Launching the layout from a script was working well for the past year or two, but it broke a few days ago.

Line 20 is resize-pane -x 44 and instead of the width being set to 44 columns as expected, now the height gets set to 44 lines. But when I walk through the steps one by one for my layout, when I do resize-pane -x 44, it works as expected.

This happens to this pane even when I move the resize-pane command to a different line -- i.e., when I have the various resizing commands done in a different order, this particular pane 5 gets the height changed instead of the width.

As far as I know, I have not made any changes that would cause this. (I guess some Windows or Ubuntu update could have bizarrely broken it somehow.)

I am using the version of tmux that either comes stock with Ubuntu 20.04, or that I was able to install from the normal WSL2 Ubuntu repository. Using tmux -V, it turns out to be "tmux 3.2a". I see that the current version is 3.5a, so I will try installing that.

Edit - I am having trouble installing version 3.5. Meanwhile, after closing all open Terminal windows, the script is again working properly. (I guess I should have tried that first.)