Low voltage on homerun
It sounds like the 23V is “phantom voltage” from capacitive coupling (read: picking it up like radio waves) from the adjacent hot wire.   Sort of the way a crystal AM radio can make an earphone sound solely off power picked up from the airwaves, except instead of an earphone it’s a highly sensitive meter (most cheap DVMs are highly sensitive).  That only happens if the neutral is disconnected at both ends.
It’s disconnected at the load end because all loads are turned off.
Go look for the reason it is disconnected at the service panel end.  Either the connection at the breaker isn’t very good, or at the first receptacle, or (rather unlikely) the wire is broken enroute.