You are right. For some reason it works on my local test server, but looking closer at the code it should not, as that table is used in a left join as well, so the query should not know which one to use within comparision. I guess it either depends on the database version, or some sort of configuration.
Anyways, I will make sure to include the fixed code in the upcoming release.
Thank you again for letting me know!Best,
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