I’ve experienced twice parts of a Spanish audio file not being transcribed and the workaround was to reencode it via https://online-audio-converter.com/
See :
(Android, Spanish)
I imported a podcast’s MP3 file (see source and file below)
but the audio transcription omits a full minute of text at the 59 second mark.
I didn’t go further, so it’s possible it occurs more than once with this file.
When playing the audio, the audio-text synchronization is wrong of course.
You can witness the problem by playing the audio with the embedded player below and reading the text in the screenshot below.
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