its a core bug in the beta 3.1.3.
as written in first post:
use beta 3.1.3 in own risk.
Arcemu hasnt still released any official 3.1.3 core,
this is still a unofficial beta patched 3.0.9 core that accept 3.1.3.
most likely it will be fixed in later patches or when arcemu releases 3.1.3.
we are updating repacks every time a new patch/release comes.
want a stable server? then use 3.0.9 until a stable 3.1.3 comes
and we dont support the emulator issues since its not our created work

thats up to arcemu developer team and in this case Vlack,
that made the unofficial patch.
our team made only the database used in emulator