Display failed with Webdisplay mod

[MicroNeutron]

Your CleanroomMC Discord Username

No response

Cleanroom Version

0.3.20-alpha

Java Version

Java 21

Graphics Card Vendor

NVidia

Bug Report

Display failed with Webdisplay mod. All websites display as white screen:

Remaster and unofficial versions tried and didn't work. Perhaps caused by mcef for warning that it does not support Java 21.

Mod List

Fugue 0.18.6
mcef 1.11
Scalar Lagacy 1.0.1
WebDisplays 1.2

Final Checklist

• I have searched the issues and haven't found a similar issue.
• I have read the readme and know that what is action build.
• I have installed Fugue and it didn't fix my issue.
• I have installed Scalar Legacy and it didn't fix my issue.
• I have switched my Forgelin and LibrarianLib to continuous versions(check readme for more detail).
• I am running a test build from Cleanroom Github Actions. (Or, if I've compiled it myself I plan to fix the issue)
• I did not use PCL/PCLCE or other unsupported launchers.
  我没有使用 PCL/PCLCE 等其他未被支持的启动器。

[kappa-maintainer]

Post log?

[MicroNeutron]

minecraft-exported-logs-2025-10-14T14-49-59.log
The game didn't crash, this is the starting log.

[kappa-maintainer]

Can reproduce, but have no idea how this mod works
Will ask some OpenGL master for help