[Linux] Graphical glitches with ambient occlusion higher than very low

I’m experiencing this exact issue detailed in an old post.

System:    Kernel: 5.11.6-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 Desktop: KDE Plasma 5.21.3 Distro: Manjaro Linux 
           base: Arch Linux 
Machine:   Type: Desktop Mobo: ASRock model: B450 Pro4 serial: <filter> UEFI: American Megatrends v: P1.50 date: 11/05/2018 
Battery:   Device-1: hidpp_battery_0 model: Logitech MX Ergo Multi-Device Trackball charge: 55% (should be ignored) 
           status: Discharging 
           Device-2: sony_controller_battery_00:1b:fb:2b:ee:33 model: N/A charge: N/A status: N/A 
CPU:       Info: 8-Core model: AMD Ryzen 7 2700X bits: 64 type: MT MCP arch: Zen+ rev: 2 cache: L2: 4 MiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 118223 
           Speed: 3633 MHz min/max: 2200/3700 MHz boost: enabled Core speeds (MHz): 1: 3633 2: 3974 3: 1984 4: 2035 5: 1900 
           6: 2111 7: 4244 8: 4263 9: 2100 10: 1894 11: 2132 12: 2132 13: 2014 14: 2034 15: 2410 16: 2335 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Vega 10 XL/XT [Radeon RX Vega 56/64] vendor: ASUSTeK driver: amdgpu 
           v: kernel bus-ID: 28:00.0 
           Display: x11 server: X.Org 1.20.10 driver: loaded: amdgpu,ati unloaded: modesetting resolution: 1: 1920x1080~60Hz 
           2: 1920x1080~60Hz 
           OpenGL: renderer: Radeon RX Vega (VEGA10 DRM 3.40.0 5.11.6-1-MANJARO LLVM 11.1.0) v: 4.6 Mesa 20.3.4 
           direct render: Yes 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] Vega 10 HDMI Audio [Radeon Vega 56/64] driver: snd_hda_intel v: kernel 
           bus-ID: 28:00.1 
           Device-2: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: ASRock driver: snd_hda_intel v: kernel 
           bus-ID: 2a:00.3 
           Device-3: Logitech [G533 Wireless Headset Dongle] type: USB driver: hid-generic,snd-usb-audio,usbhid bus-ID: 1-3:2 
           Sound Server-1: ALSA v: k5.11.6-1-MANJARO running: yes 
           Sound Server-2: JACK v: 1.9.17 running: no 
           Sound Server-3: PulseAudio v: 14.2 running: yes 
           Sound Server-4: PipeWire v: 0.3.23 running: no 
Network:   Device-1: Intel Wireless 8265 / 8275 driver: iwlwifi v: kernel bus-ID: 22:00.0 
           IF: wlp34s0 state: down mac: <filter> 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASRock driver: r8169 v: kernel port: d000 
           bus-ID: 25:00.0 
           IF: enp37s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
Bluetooth: Device-1: Intel Bluetooth wireless interface type: USB driver: btusb v: 0.8 bus-ID: 1-8:4 
           Report: This feature requires one of these tools: hciconfig/bt-adapter 
RAID:      Device-1: md127 type: mdraid level: raid-0 status: active size: 238.15 GiB 
           Info: report: N/A blocks: 249722880 chunk-size: 128k 
           Components: Online: 0: sdc1 1: sdd1 
Drives:    Local Storage: total: 816.04 GiB used: 427.28 GiB (52.4%) 
           ID-1: /dev/sda vendor: Intel model: SSDSC2BW120A4 size: 111.79 GiB 
           ID-2: /dev/sdb vendor: Seagate model: ST500DM002-1BD142 size: 465.76 GiB 
           ID-3: /dev/sdc vendor: Samsung model: MZ7PA128HMCD-010L1 size: 119.24 GiB 
           ID-4: /dev/sdd vendor: Samsung model: MZ7PA128HMCD-010L1 size: 119.24 GiB 
Partition: ID-1: / size: 92.32 GiB used: 55.49 GiB (60.1%) fs: ext4 dev: /dev/sda2 
           ID-2: /boot/efi size: 299.4 MiB used: 280 KiB (0.1%) fs: vfat dev: /dev/sda1 
Swap:      ID-1: swap-1 type: partition size: 17.2 GiB used: 0 KiB (0.0%) dev: /dev/sda3 
Sensors:   System Temperatures: cpu: 46.9 C mobo: N/A gpu: amdgpu temp: 30.0 C 
           Fan Speeds (RPM): N/A gpu: amdgpu fan: 1 
Info:      Processes: 351 Uptime: 3h 01m Memory: 15.63 GiB used: 2.87 GiB (18.4%) Init: systemd Compilers: gcc: 10.2.0 
           clang: 11.1.0 Packages: 1524 Shell: Bash v: 5.1.0 inxi: 3.3.03

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