The issue appears fixed with new firmware, but now the laptop won't suspend.

# cat /sys/kernel/debug/dri/0/amdgpu_firmware_info
VCE feature version: 0, firmware version: 0x00000000
UVD feature version: 0, firmware version: 0x00000000
MC feature version: 0, firmware version: 0x00000000
ME feature version: 40, firmware version: 0x00000099
PFP feature version: 40, firmware version: 0x000000ae
CE feature version: 40, firmware version: 0x0000004d
RLC feature version: 1, firmware version: 0x0000d237
RLC SRLC feature version: 1, firmware version: 0x00000001
RLC SRLG feature version: 1, firmware version: 0x00000001
RLC SRLS feature version: 1, firmware version: 0x00000001
MEC feature version: 40, firmware version: 0x0000018b
MEC2 feature version: 40, firmware version: 0x0000018b
SOS feature version: 0, firmware version: 0x00000000
ASD feature version: 0, firmware version: 0x0017ba78
SMC feature version: 0, firmware version: 0x00001e49
SDMA0 feature version: 41, firmware version: 0x000000a9
VCN feature version: 0, firmware version: 0x01004912
DMCU feature version: 0, firmware version: 0x00000001
VBIOS version: 113-RAVEN-106