TL;DR: Cursor themes should be installed at /usr/share/icons, not /usr/share/cursors/x11-xorg which is Gentoo-specific (apparently) and doesn't work with Wayland. Note that because of bug 834600, workarounds like in x11-themes/adwaita-icon-theme will be needed (see b61c3fc638ce388659557b5cebd5484251f84d90). See https://bugs.gentoo.org/838451#c12.
$ rg /usr/share/cursors/xorg-x11 -l | xargs grep /usr/share/icons -L | cut -d/ -f1-2 | sort -u x11-themes/blueglass-xcursors x11-themes/chameleon-xcursors x11-themes/comix-xcursors x11-themes/golden-xcursors x11-themes/haematite-xcursors x11-themes/neutral-xcursors x11-themes/obsidian-xcursors x11-themes/pearlgrey-xcursors x11-themes/pulse-glass x11-themes/silver-xcursors x11-themes/vanilla-dmz-aa-xcursors x11-themes/vanilla-dmz-xcursors
That's what I was saying back in #834001, but no one listened.
(In reply to Sorrow from comment #2) > That's what I was saying back in #834001, but no one listened. Someone did listen - they fixed adwaita. They just didn't have the initiative to file a tracker and file lots of other bugs. It is what it is.
I think we could probably simply move to the new location and drop the old one. /usr/share/icons looks to be looked for used and, like that, we don't need to play with the symlink