Having successfully convinced me to move away from Xfce after GNOME 2 was deprecated, my main DE has been MATE for such a long time. However, I am being wooed by KDE Plasma lately. I remember running Plasma 5.26 on Slackware 15-current and was blown away at how snappy it was on an old Dell Latitude E6410 with a 1st-gen Core i5 520M! I can only imagine how nice Plasma 6.x is in comparison.

MATE has also been stable for me on the BSD side, running it on OpenBSD and FreeBSD, but Plasma might woo me away on there as well, especially once Plasma 6 is available on OpenBSD 7.6.

I also prefer to run Fluxbox on much less powerful hardware, regardless of the OS it's on.

Yeah, that's what mine "upgraded" to. All that update does is rollback to 5.4.5.

For those on Android running Termux, it is also affected. Just checked my version of xz-utils and it was 5.6.1. Running "pkg upgrade" will roll back to version 5.4.5 (tagged as "5.6.1+really5.4.5" for both liblzma and xz-utils packages).