VLC thumbnails without subtitle overlay

[shaker]

I want to get the thumbnails of the input mkv media files with the selected the subtitle track, the command line is like this:
vlc ./input.mkv --sub-track=0 --rate=1 --video-filter=scene --vout=dummy --start-time=10 --stop-time=11 --scene-format=png --scene-ratio=24 --scene-prefix=snap --scene-path=./ vlc://quit

But the snapshot pictures have NO subtitle overlay. But when I press the Snapshot button from the menu, it works with the subtitle overlay.
Which command line should I use to get the snapshot with subtitle overlay? Thanks.

[Jean-Baptiste Kempf]

This is fixed for 3.0.2