Executors do not spin correctly when launched separately

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Hello,

I would like to build a modular package in which you can model some ROS systems using YAML files. You can find the github repository here:

https://github.com/HarunTeper/ros_sys...

However, when launching "launch_system.launch.py", the created executors do not spin correctly in their corresponding threads, but are somehow stuck in the spinning process without executing the nodes. In "src/system_composition.cpp" I try to create a vector of executors and create a separate thread for each that I also save in a vector. While everything is generated correctly, the executors are not spinning correctly.

What do I need to change to get the correct behaviour?