I cordially suggest that you should very carefully check those logs, and, if you continue to believe that this is really what is happening, please post an excerpt of those logs and further explain your reasoning. Because I think that you are being misled.
I started to say that maybe $sensor contains > and/or >> sequences. But my casual experiments seem to show that, although the shell does allow this sort of thing without throwing an error, it only writes data to the last file specified. Which, given how the command is written, would always be worklog in the current directory.
Therefore, I suggest that you look further. I predict that the actual bug lies somewhere other than here. Happy to be proven wrong.
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