Crashes on ALT+TAB under Wayland unless set to windowed

[C0rn3j]

Operating System: Arch Linux 
KDE Plasma Version: 6.1.1
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel Version: 6.9.6-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
Memory: 62.0 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4090/PCIe/SSE2
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: X670 AORUS ELITE AX

Full system info

Computer Information:
Manufacturer: Gigabyte Technology Co., Ltd.
Model: X670 AORUS ELITE AX
Form Factor: Desktop
No Touch Input Detected
Processor Information:
CPU Vendor: AuthenticAMD
CPU Brand: AMD Ryzen 5 7600X 6-Core Processor
CPU Family: 0x19
CPU Model: 0x61
CPU Stepping: 0x2
CPU Type: 0x0
Speed: 5453 MHz
12 logical processors
6 physical processors
Hyper-threading: Supported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Supported
SSE41: Supported
SSE42: Supported
AES: Supported
AVX: Supported
AVX2: Supported
AVX512F: Supported
AVX512PF: Unsupported
AVX512ER: Unsupported
AVX512CD: Supported
AVX512VNNI: Supported
SHA: Supported
CMPXCHG16B: Supported
LAHF/SAHF: Supported
PrefetchW: Unsupported
Operating System Version:
Freedesktop SDK 23.08 (Flatpak runtime) (64 bit)
Kernel Name: Linux
Kernel Version: 6.9.7-arch1-1
X Server Vendor: The X.Org Foundation
X Server Release: 12401000
X Window Manager: KWin
Steam Runtime Version: steam-runtime_0.20240610.91380
Video Card:
Driver: NVIDIA Corporation NVIDIA GeForce RTX 4090/PCIe/SSE2
Driver Version: 4.6.0 NVIDIA 555.58.02
OpenGL Version: 4.6
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 239 Hz
VendorID: 0x1002
DeviceID: 0x164e
Revision Not Detected
Number of Monitors: 3
Number of Logical Video Cards: 2
Primary Display Resolution: 2560 x 1440
Desktop Resolution: 8960 x 2160
Primary Display Size: 23.23" x 13.15" (26.65" diag), 59.0cm x 33.4cm (67.7cm diag)
Primary VRAM: 24564 MB
Sound card:
Audio device: USB Mixer
Memory:
RAM: 63440 Mb
VR Hardware:
VR Headset: None detected
Miscellaneous:
UI Language: English
LANG: en_GB.UTF-8
Total Hard Disk Space Available: 959809 MB
Largest Free Hard Disk Block: 170251 MB
Storage:
Number of SSDs: 13
SSD sizes: 8001G,8001G,6001G,6001G,3000G,2048G,2000G,0B,0B,0B,0B,0B,0B
Number of HDDs: 0
Number of removable drives: 0

Steps for reproducing this issue:

0. Use kwin - may not be necessary, but that's my compositor
1. Launch CS2 from Steam under Flatpak - Flatpak may not be necessary to trigger
2. Ensure game is set to Fullscreen or Windowed Fullscreen
3. ALT+TAB a couple of times, the game will freeze, crash or both

Downstream report on Arch Forums
Report on KDE's kwin tracker - they blame the app.

[ilievi187]

Replying to #3801 (comment)

I have observed this issue in both Windows 10 and 11. Initially, I thought it was just due to Windows' poor drivers, but I have realized it's actually a CS2-related problem (though the drivers are still problematic). .