Ah, thanks for letting me know, I did not know this. I actually thought @Ste74 still maintains the MATE Edition because he temporarily used my mate-tweak pull request as a patch to make mate-tweak work for Manjaro.
This PR was not merged and the issue was allegedly fixed in 20.10.0 which is not true, it is still broken.
I would be very grateful if at least the Ayatana Indicators could get integrated because they make the MATE desktop so much more usable. To attract more users (and Developers) a more polished Manjaro MATE Edition could really help. As I said I am willing to help integrating this changes and help maintaining the MATE Edition as well.