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What became of the issue with the Yaw damper and other systems failing with the loss of GPS signal?

GENOT 7110.711 EMB-300 (faa.gov)

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See FOL PHE505-006/16

When GPS signal is not available, the AHRS 1 FAULT and AHRS 2 FAULT CAS messages will be displayed simultaneously, indicating that both AHRS are operating in a degraded mode. This is different than an AHRS FAILURE, where the AHRS system becomes inoperative.

In case AHRS 1 FAULT and AHRS 2 FAULT are displayed simultaneously, maintaining a high airspeed increases the chances of a miscompare between AHRS units. Thus, pilot action may be required to reduce the airspeed in accordance with the related QRH procedure (Airspeed – MAX 240 KIAS/0.63 Mach) to avoid the AHRS 1 and AHRS 2 miscompare.

Observing this speed schedule ensures the normal operation of the airplane.

The following avionics loads improve aircraft ventral rudder system availability in a situation of AHRS miscompare:

G1000 (9X) - avionics load version 92.00
G3000 (1X+) - avionics load version 18.00

Load 92 was released mid 2017.