"The problem is that the release may be wrongly credited on the sleeve/label..."
If it appeared on the marketplace it's a valid entry. Discogs has nothing to do real world copyrights (or music for that matter.) It has everything to do with the graphic artwork that got sent to the printer in year yyyy. You are documenting artwork not copyrights. Period. Paragraph.

"It's not hijacked content..."
There is no content to "hijack." It's about the imaging. If you neglect to upload imaging and/or fill in all the blanks on Discogs another user can edit your German first press submission to a Jamaican reissue. Entering as much data as possible will help prevent this.

"That information, if used as a source of who wrote a song, becomes a myth and helps to destroy the copyright and reputation of the songwriter."
Nothing you do on Discogs will alter the fact that it was never a valid reference source to begin with. The Discogs d/b reflects thousands, if not hundreds of thousands, of Companies, Labels, Series and Credits that do not exist elsewhere. It's unvalidated social media. Nada mas.