Several mentions on the Illustrator user forum about patterns changing (content or color) when copied/pasted:
and one on uservoice that looks similar:
Thanks for reporting this issue, Illustrator Team really appreciate this.
We have tried to address this issue in our Prerelease build of 25.4.0 .
Please visit adobe.ly/1o2SDsg to join our pre-release program and get the Prerelease build of version 25.4.0 from CCD “Prerelease” tab in Categories section.
Please do let us know if this issue is resolved for you or not.
With Best Regards,
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