I have the same problem: Couatl is started, but end until MSFS is ready to start.
I also have uninstalled FSDT GSX Pro and FSDT Installer, deleted the directories wich are linked in the community directory and also installed the Addon Manager from your work around file space.
Nothing helps, I could start Couatl before MSFS and it works normal, if I start it again the debug mode starts well, but a few seconds after loading MSFS the task ends.
That's my logfile content:
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Running in mode: Microsoft Flight Simulator
Python 2.7.16 Stackless 3.1b3 060516 (default, Mar 9 2019, 21:32:11) [MSC v.1500 64 bit (AMD64)] wxPython 3.0.2.0
couatl v4.8 (build 4811)
log started on Fri Aug 26 20:28:48 2022
connecting to SimConnect...
connected to SimConnect
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Nothing more!!!
Very frustrating :-(