Portal 2 Crashes when loading any beta branch or proton except the main version of the game.

[blockplace1232]

This bug is really annoying because I need too switch too an older version of Portal 2 to fix another bug I am experiencing but Portal 2 won't even start up.

I click play, wait a couple seconds and then it closes.

Here are my specs:

Computer Information:
Manufacturer: HP
Model: 87FE
Form Factor: Laptop
No Touch Input Detected
Processor Information:
CPU Vendor: GenuineIntel
CPU Brand: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
CPU Family: 0x6
CPU Model: 0x8c
CPU Stepping: 0x1
CPU Type: 0x0
Speed: 4200 MHz
8 logical processors
4 physical processors
Hyper-threading: Supported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
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
BMI1: Supported
BMI2: Supported
F16C: Supported
FMA: Supported
Operating System Version:
"Arch Linux" (64 bit)
Kernel Name: Linux
Kernel Version: 6.14.1-arch1-1
X Server Vendor: The X.Org Foundation
X Server Release: 12401006
X Window Manager: KWin
Steam Runtime Version: steam-runtime_1.0.20250307.120442
Client Information:
Version: 1743554648
Browser GPU Acceleration Status: Enabled
Browser Canvas: Enabled
Browser Canvas out-of-process rasterization: Enabled
Browser Direct Rendering Display Compositor: Disabled
Browser Compositing: Enabled
Browser Multiple Raster Threads: Enabled
Browser OpenGL: Enabled
Browser Rasterization: Enabled
Browser Raw Draw: Disabled
Browser Skia Graphite: Disabled
Browser Video Decode: Enabled
Browser Video Encode: Disabled
Browser Vulkan: Disabled
Browser WebGL: Enabled
Browser WebGL2: Enabled
Browser WebGPU: Disabled
Browser WebNN: Disabled
Video Card:
Driver: Intel Mesa Intel(R) Iris(R) Xe Graphics (TGL GT2)
Driver Version: 4.6 (Compatibility Profile) Mesa 25.0.3-arch1.1
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 59 Hz
VendorID: 0x8086
DeviceID: 0x9a49
Revision Not Detected
Number of Monitors: 2
Number of Logical Video Cards: 1
Primary Display Resolution: 1440 x 900
Desktop Resolution: 3360 x 1080
Primary Display Size: 16.14" x 10.12" (19.02" diag), 41.0cm x 25.7cm (48.3cm diag)
Primary VRAM Not Detected
Sound card:
Audio device: Realtek ALC236
Memory:
RAM: 7580 Mb
VR Hardware:
VR Headset: None detected
Miscellaneous:
UI Language: English
LANG: en_GB.UTF-8
Total Hard Disk Space Available: 231110 MB
Largest Free Hard Disk Block: 8399 MB
Storage:
Number of SSDs: 1
SSD sizes: 256G
Number of HDDs: 0
Number of removable drives: 0