I have noticed that arrangers are displayed as composers. This is wrong, and confusing. Is this intentional ?
Here is an example - Clare Fischer is not the composer of these Duke Ellington tunes:
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Yes - it is. 
See: https://kb.roonlabs.com/Credit_Roles
I think this has been questioned now and again but so far there was no decision made to change it. And Iām not sure how the Roonlabs team thinks about it.
Well then, given the number of issues with credits in Roon I have simply decided to use other data sources for my needs.