EDIT: Sorry, didn't realise this was a markdown field. I'll repeat the details above, without additional karma changes for readability:

Upon applying this update, I was unable to add an additional port for SSH:

# /sbin/semanage port -a -t ssh_port_t -p tcp 1234
libsepol.context_from_record: type pkcs_slotd_unit_file_t is not defined
libsepol.context_from_record: could not create context structure
libsepol.context_from_string: could not create context structure
libsepol.sepol_context_to_sid: could not convert system_u:object_r:pkcs_slotd_unit_file_t:s0 to sid
invalid context system_u:object_r:pkcs_slotd_unit_file_t:s0
libsemanage.semanage_validate_and_compile_fcontexts: setfiles returned error code 255.
OSError: [Errno 0] Error

Looking at sudo dnf history info <tx ID> showed a number of errors during installation:

   1 neverallow check failed at /var/lib/selinux/targeted/tmp/modules/100/base/cil:8980
   2   (neverallow base_typeattr_8 self (capability (sys_module)))
   3     <root>
   4     allow at /var/lib/selinux/targeted/tmp/modules/300/systemdmodules-syscapability/cil:2
   5       (allow init_t self (capability (sys_module)))
   6 
   7 Failed to generate binary
   8 semodule:  Failed!
(and repeat 6 times)

Upon downgrading back to 283.24, everything worked again, no install errors.

-14 now has both X Forwarding (and therefore x2go) now working once again as they should - thanks!

LGTM - allows co-installation with nspr-devel now - thanks!