Reproduction steps:
1. Open the attached “IN-93685_steam_deck“ project
2. Open the “Assets/_<project name>/Runtime/Input Actions/Input Actions.inputactions“ file
3. Go to UI > Navigate, make sure “Action Type” is set to “Pass Through”
4. Build the project for Linux target
5. Transfer the Player to the Steam Deck
6. Add Player executable to Steam as a Non-Steam Game
7. Make sure Steam Input is enabled
8. Launch the Player
9. Use a D-Pad to navigate the UI
10. If at this point the navigation is instant, then try using the Left Stick to navigate the UI, and then use the D-Pad again

Expected results: Menu navigation is instant when using the D-Pad just as with any other controller
Actual results: Can’t navigate at all or the navigation is lagging when using the D-Pad

Reproduced with: 1.12.0 (2022.3.57f1, 6000.0.37f1, 6000.1.0b5, 6000.2.0a2)

Reproduced on: SteamOS (Steam Controller through Steam Input)
Not reproduced on: Windows 11, Ubuntu 24.04 (Dualsense and Xbox controllers)

Notes:

• Reproduced with “UNITY_ENABLE_STEAM_CONTROLLER_SUPPORT“ Scripting Define both included and not included
• Reproduced on both IL2CPP and Mono
• Reproduced on OpenGL and Vulkan
• Noticed that this issue does not reproduce every time the Player is launched, not sure what causes these discrepancies.