Windows just runs the associated program for the file extension. If I understand correctly you're starting a batch script (which is likely using Terminal?) to then start Windows Terminal (the wt
) command. You really shouldn't need to do both.
As discussed in the command line options here you should probably set the value to useAnyExisting
if you want it to reuse an existing tab. By default it will always open a new window and since you're starting a batch file that makes sense.