application does not handle SIGTERM an azure AKS

Question

I have a containerized NestJS application. If I run it locally using docker, I can shut it down gracefully which I can see via logging. If I run the same container on AKS, there is no log output about shutting down on pod deletion. The pod rather stay in state Terminating for half a minute and is then deleted.

If I execute a shell inside the container on AKS, a ps shows me, that my application is running with PID 1. If I send a SIGTERM to PID 1 using kill -15 1, the application does neither log the signal, nor does it shut down while becoming unresponsive at the same time.

/app $ ps
PID   USER     TIME  COMMAND
    1 node      0:03 node main.js
   18 node      0:00 sh
   25 node      0:00 ps
/app $ kill -15 1
/app $ ps
PID   USER     TIME  COMMAND
    1 node      0:03 node main.js
   18 node      0:00 sh
   27 node      0:00 ps

If I do the same with the same container using docker locally, my application logs the received signal and shuts down.

/app $ ps
PID   USER     TIME  COMMAND
    1 node      0:03 node main.js
   18 node      0:00 sh
   25 node      0:00 ps
/app $ kill -15 1
/app $ <shell exited here as container was removed by docker>

What am I missing here?