Alt+Shift fails to change keyboard layout when both keys are pressed simultaneously (worked in Windows 10)

Summary

Since upgrading to Windows 11 the classic shortcut Left Alt + Left Shift misses ~30 % of presses when both keys are tapped quickly and simultaneously. Windows 10 never exhibited this behaviour. The shortcut MUST be mapped on Left Alt + Left Shift.

Environment

• Windows 11 Pro 23H2 (build 22631.xxxx)   <!-- replace with your exact build -->
• Two input languages installed (English ‑ US & Russian)
• Advanced keyboard settings → “Switch input language” = Left Alt + Left Shift
• Reproduced on four different PCs (USB & Bluetooth keyboards) and one Hyper‑V VM.

Steps to Reproduce

1. Open any text field (e.g., Notepad).
2. Tap Alt and Shift together and release immediately.
3. Repeat ~20 times.

Expected Result

Layout toggles on every keypress (Windows 10 behaviour).

Actual Result

About one third of presses leave the current layout unchanged; sometimes the task‑bar indicator blinks twice and reverts to the original language.
Shortcut Win + Space always works, proving the issue is specific to Alt + Shift.

Community Evidence

• Microsoft Q&A post: “Changing language on Windows 11 with Alt+Shift does not work if you release both buttons simultaneously,” Oct 2023
• Microsoft Tech Community thread: “Windows 11 language switch hot keys don't always work or work slowly,” Apr 2024
• ElevenForum discussion: “Horrible Keyboard Input Language Switch Lag after Win 11 22H2 update,” Dec 2022
• MiniTool article aggregating reports: “Alt + Shift Not Changing Language on Windows 11,” Nov 2024

Troubleshooting Attempted

• Re‑assigned and reset key sequence
• Disabled Sticky Keys, “per‑window input,” and all accessibility keyboard options
• Clean boot, SFC / DISM, latest firmware & drivers
• Different keyboards and ports – issue persists

Impact

Fast, reliable layout switching is essential for bilingual users (coding ↔ native language, password input, command lines). Missed switches lead to mistyped passwords, corrupted commands, and significant frustration.

Request

Please confirm this regression in Alt + Shift handling and provide a fix or workaround that preserves the long‑standing shortcut behaviour from Windows 10.