Couldn't input backslash(\), pipe(|) and Muhenkan in Japanese keyboard

[FoxRefire]

Describe the bug
Pressing the backslash, pipe or Muhenkan key on a Japanese keyboard layout will not produce any input.

Steps to reproduce
Attempting to type backslash, pipe, or Muhenkan key into a text area

Screenshots

VID_20260804_155245.mp4

Affected games
All

Moonlight settings (please complete the following information)

• Have any settings been adjusted from defaults?: No

Client PC details (please complete the following information)

• OS: Kubuntu 26.04
• Moonlight Version: 6.1.0
• GPU: Intel® Iris® Xe Graphics
• Linux package type (if applicable): Deb package

Server PC details (please complete the following information)

• OS: [e.g. Windows 10 1809]
• Sunshine or GeForce Experience version: [e.g. Sunshine v0.21.0]
• GPU: NVIDIA RTX 5070
• GPU driver: 595.84

[Twoface227]

Just wanted to add that I also have the same issue. I have tried via Japanese laptop keyboard and a full sized Japanese 106 with keypad. Have verified that the host(s) have proper Japanese keyboard setup and works correctly locally. Have verified that the Japanese layout is being sent from Moonlight to Sunrise, as other keys non-US standard layout keys are being passed correctly - ie @, ", etc.

The following keys are not being sent over by Moonlight.

• yen/pipe key
• backslash/underbar
  As for the muhenkan, henkan, and (hiragana, katakana, romaji) keys, I do not use them, so I have no basis for a testing method on them.

I have tested this in Cinnamon in X11 and Wayland, with fcitx completely disabled, and unchecking "Always Send Scancodes" in Sunshine. It does not seem that these keys are being sent by Moonlight at all. Did some web searching which brought me here. Asked the AIs, but Gemini and Grok are saying this is due to how Moonlight is processing the scancodes, and is most likely dropping them "... due to Japanese JIS keyboards having extra keys that don’t exist in the same physical positions on a US layout." The work-arounds suggested, require remapping the keys on both client and host sides, but this feels like its something that should already work in Moonlight.

Please let us know what information you need so that we can help getting these keys working natively through Moonlight.

Have any settings been adjusted from defaults?: No
Client PC details

OS: Arch with Cinnamon - X11 or Wayland (experimental)
Moonlight Version: 6.1.0
GPU: Intel® UHD Graphics 620 (WHL GT2)
Linux package type (if applicable): Arch repo - moonlight-qt

Server PC details

OS: Win10 Pro 22H2 / CachyOS KDE - Wayland
Sunshine version: 2026.516.143833 and multiple versions prior (2025'ish)
GPU: NVIDIA 1060 6GB and AMD 9060xt 16GB (prior to GPU upgrade and post upgrade to AMD)
GPU driver: Nvidia - 582.28 / AMD - 26.5.2 (prior to GPU upgrade and post upgrade to AMD)

[FoxRefire]

These PRs fixes this issue, need to merge all of these PRs
#1984
LizardByte/Sunshine#5542
LizardByte/libvirtualhid#101