The following mask changes are necessary to proceed:
(see "package.unmask" in the portage(5) man page for more details)
# required by net-libs/nodejs-20.5.1::gentoo
# required by www-client/firefox-102.15.0::gentoo
# required by @selected
# required by @world (argument)
=dev-libs/openssl-1.1.1v
And many many many more packages. I went through like 20 yesterday and created custom ebuilds without mentions to slot :0= in ebuild, but there is plenty more.