Audio lost upon starting to Edit Lesson

I have imported several audio files (m4a) and let LingQ create audio transcripts. Both in Page View and in Sentence View, the audio plays nicely.
However, if I enter the Edit Lesson screen, even without actually making any changes, I notice that the small timeline to the left shows timestamps of 00:00 - 00:00.
The link between the lesson and the audio file seems to be lost! Clicking on individual paragraphs no longer loads the play button with the associated timestamp fields. Upon exiting the Edit Lesson screen, the play button is disabled.
I can re-import the original audio file, and everything seems to work well again, including the timestamps generated the first time around. But as soon as I open the Edit Lesson screen again, the audio is lost again.
This only happens in the web app, opening the lesson on iOS does not show the bug.
Also, entering Edit Sentence and even making changes there works well.
I consider listing to the audio is a key feature of LingQ, so please provide assistance and/or fix the bug.

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Thanks for reporting, we will investigate the issue.

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Hi @helmuth1980 !
Can you please share a link to such a lesson?
It will help to inspect the issue.

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@Denys_B By sharing the link here, the lesson would be made available to anyone. However, due to copyright issues, I need it to stay private. Do you have access to my lessons/courses in general? Is there a way I can send you a private message?

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@helmuth1980 Thanks, we were able to figure out what the problem is and our developers are now working on it. Appreciate your assistance on this.

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