I can confirm what Cencil reported. The issue is also not solved on Polaris GPUs. I fully updated my system yesterday and this evening after a couple of youtube videos it crashed again.
Kernel 5.12
linux-firmware 20210629
AMD RX 480
-- Journal begins at Thu 2021-01-21 08:14:09 CET, ends at Wed 2021-07-14 22:12:10 CEST. --
Jul 14 20:57:07 ManjaroGamingPC kernel: [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for fences timed out!
Jul 14 20:57:07 ManjaroGamingPC kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but soft recovered
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: GPU fault detected: 146 0x0048080c for process plasmashell pid 1790 thread plasmashel:cs0 pid 1878
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x00000009
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0400800C
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM fault (0x0c, vmid 2, pasid 32772) at page 9, read from 'TC0' (0x54433000) (8)
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: GPU fault detected: 146 0x0068040c for process plasmashell pid 1790 thread plasmashel:cs0 pid 1878
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x0010084D
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x04008008
Jul 14 20:57:07 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM fault (0x08, vmid 2, pasid 32772) at page 1050701, read from 'TC0' (0x54433000) (8)
Jul 14 20:57:17 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: GPU fault detected: 147 0x0aa02008 for process plasmashell pid 1790 thread plasmashel:cs0 pid 1878
Jul 14 20:57:17 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x00108554
Jul 14 20:57:17 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x04020008
Jul 14 20:57:17 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: VM fault (0x08, vmid 2, pasid 32772) at page 1082708, read from 'CB2' (0x43423200) (32)
Jul 14 20:57:17 ManjaroGamingPC kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=1258798, emitted seq=1258801
Jul 14 20:57:17 ManjaroGamingPC kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process plasmashell pid 1790 thread plasmashel:cs0 pid 1878
Jul 14 20:57:17 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: GPU reset begin!
Jul 14 20:57:21 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: failed to suspend display audio
Jul 14 20:57:21 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: [drm:amdgpu_ring_test_helper [amdgpu]] *ERROR* ring kiq_2.1.0 test failed (-110)
Jul 14 20:57:21 ManjaroGamingPC kernel: [drm:gfx_v8_0_hw_fini [amdgpu]] *ERROR* KCQ disable failed
Jul 14 20:57:22 ManjaroGamingPC kernel: amdgpu: cp is busy, skip halt cp
Jul 14 20:57:22 ManjaroGamingPC kernel: amdgpu: rlc is busy, skip halt rlc
Jul 14 20:57:22 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: BACO reset
Jul 14 20:57:22 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: GPU reset succeeded, trying to resume
Jul 14 20:57:22 ManjaroGamingPC kernel: [drm] PCIE GART of 256M enabled (table at 0x000000F400300000).
Jul 14 20:57:22 ManjaroGamingPC kernel: [drm] VRAM is lost due to GPU reset!
Jul 14 20:57:24 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:25 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:26 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:27 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:28 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:29 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:30 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:31 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:32 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:32 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!
Jul 14 20:57:32 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, trying to reset the VCPU!!!
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:uvd_v6_0_start [amdgpu]] *ERROR* UVD not responding, giving up!!!
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:amdgpu_device_ip_set_powergating_state [amdgpu]] *ERROR* set_powergating_state of IP block <uvd_v6_0> failed -1
Jul 14 20:57:33 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: [drm:amdgpu_ring_test_helper [amdgpu]] *ERROR* ring uvd test failed (-110)
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of IP block <uvd_v6_0> failed -110
Jul 14 20:57:33 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: GPU reset(3) failed
Jul 14 20:57:33 ManjaroGamingPC kernel: amdgpu 0000:26:00.0: amdgpu: GPU reset end with ret = -110
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!
Jul 14 20:57:33 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!
Jul 14 20:57:43 ManjaroGamingPC kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but soft recovered
Jul 14 20:57:53 ManjaroGamingPC kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but soft recovered
Jul 14 20:58:02 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!
Jul 14 20:58:02 ManjaroGamingPC kernel: [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to initialize parser -125!