I think I found the problem.
In lines 41 and 54 the script uses start_time and end_time as index in the stream val. This works, if time is without gaps and the time increment is 1 sec. In my case there are gaps (probably through autostop), leading to a difference in index and time. If I change them to start_index and end_index it works perfectly.
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Nice! I will change the script on te shared version. Thanks for troubleshooting!