x11-themes/silver-xcursors-0.4-r2 is installed in the /usr/share/cursors/xorg-x11/Silver/cursors/cursors/ (notice the double trailing "cursors/cursors"). It should be /usr/share/cursors/xorg-x11/Silver/cursors/ instead (notice a single trailing "cursors"). x11-themes/golden-xcursors-0.8-r2 doesn't have the same issue and can be used without any problem on my system.
Created attachment 704979 [details] info.txt emerge --info silver-xcursors
Created attachment 704982 [details] build.log
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=be2cb8e1c763b024640e2ae84638a803e0c93e29 commit be2cb8e1c763b024640e2ae84638a803e0c93e29 Author: Sam James <sam@gentoo.org> AuthorDate: 2021-05-01 18:21:35 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2021-05-01 18:24:12 +0000 x11-themes/silver-xcursors: fix cursor installation Closes: https://bugs.gentoo.org/787413 Signed-off-by: Sam James <sam@gentoo.org> .../{silver-xcursors-0.4-r2.ebuild => silver-xcursors-0.4-r3.ebuild} | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)