Azure Stream Analytics - After restart it doesn't produce output anymore

Question

SA worked fine for a few days.
For maintenance reasons we had to stop some Azure Services including SA.

• Since last restart SA shows input data correctly and test queries work fine.
• The logs have no errors.
• The utilization of the SU is less than 30 percent.

However, no results are produced.

I noticed that when SA starts, the watermark time is set with a datetime less than the current time
and it never changes

Since it has always worked, I was wondering why no output is produced.

I have restarted SA multiple times getting the same behavior.

Any ideas ?

thank you
Luca