Embedded subtitles do not display

[udippel]

I have some files with embedded subtitles, generated with yt-dlp. I can select the subtitle, but nothing displays. However, with the separate sub title file, the same one used when generating the video with embedded subtitle with yt-dlp, does show.
In order to exclude the generation with yt-dlp, I also used ffmpeg to generate the embedded subtitle:

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ffmpeg -i Amantes_ES.mp4 -i Amantes_ES_de.vtt -c copy -c:s mov_text -metadata:s:s:0 language=de Amantes_ES_de.mp4

Same here: VLC shows a sub title track, but its content is never displayed on the screen.

VLC version 3.0.16 Vetinari (3.0.13-8-g41878ff4f2) on *buntu 22.04 LTS

Here is the result of ffprobe:

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Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Amantes_ES_de.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.76.100 Duration: 01:39:26.64, start: 0.000000, bitrate: 1927 kb/s Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 1791 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default) Metadata: handler_name : Mainconcept MP4 Video Media Handler vendor_id : [0][0][0][0] Stream #0:1(spa): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s (default) Metadata: handler_name : Mainconcept MP4 Sound Media Handler vendor_id : [0][0][0][0] Stream #0:2: Subtitle: mov_text (tx3g / 0x67337874) (default) Metadata: handler_name : SubtitleHandler $

I searched the archives, but didn't find any hint of what is going wrong here.
Any help appreciated!