Steps to reproduce the issue:

1. Using Qt 6.9.2 installed via the online installer, build an application that uses Qt Multimedia, e.g. the multimedia/video/mediaplayer example
2. Run windeployqt --exclude-plugins ffmpegmedia <path-to-built-exe>

Expected behavior:

Since it has been explicitly excluded, the ffmpegmediaplugin.dll should not be deployed.

Actual behavior:

Regardless of what is passed to windeployqt the ffmpegmediaplugin.dll is always being deployed. Since there is no way to get a list of known plugins I'm not sure if the issue is caused by me passing the wrong plugin name to --exclude-plugins, but I've tried many different spellings, and after looking at the source code of windeployqt I'm fairly confident that ffmpegmedia is the correct name.