Change sender of prepared emails

After updating from 2.4.2 to 2.4.8 the sender of the PROOFREAD_AUTHOR_REQUEST has changed from the assigned proofreader to the principal contact/ section editor. (We have set up OJS to assign a special proofreader) .
In the sent email-header the reply-to address is correct. Is there a way to change the setting in 2.4.8?

sorry for opening a new topic - I found the explanation already in the wiki:

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