Wrong ringtone for incoming call for 2 SIM-cards

OS VERSION: 5.0
HARDWARE: x10mk3

DESCRIPTION:

In Sound settings there is an option to specify different ringtones for 2 sim-cards.
Ringtone for SIM1 and for SIM2.
A user expects to hear a SIM1 ringtone when there’s an incoming call to SIM1.
Same for SIM2.

The bug is that the ringtone that will ring is based not on a SIM-card that is receiving the call, but on the current “Active” “outgoing” SIM-card (chosen in a shutter cover).