mkv muxer drops audio language information

[dings]

mkv input File (ffprobe output):

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    Stream #0:1(deu): Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s (default)
    Stream #0:2(eng): Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s (default)


after opening it in avidemux 2.6.4, and saving ist with video:copy, audio:copy, output: mkv muxer

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    Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s (default)
    Stream #0:2: Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s (default)