The above script works fine for media 1 to 10 but does not show any information for medium 11 or higher. Example with 32(!) media: https://musicbrainz.org/release/6fa8c1fb-2572-464a-87ad-4c74b55e597e
I wanted to use the script to check by the recording comments whether all recordings are linked correctly.
Indeed, it’s an old known limitation. 
As a workaround, you can see recording comments for each medium after 10th, individually, by middle-clicking their medium header, for example: 11th medium.
But I think there is another userscript that does display all 11+ medium release recording comments on the release page, directly.
It’s murdos mb enhancements, or something like that.
Would it be so complicated to fix this?
(I’m aware that there are not so much releases with more than 10 media)
I don’t know, it’s not super easy.
I spend already too much time in front of a screen at work…
The best would be integrated in MBS. 
Vote this:
Obviously it’s not really of common interest. I’ve been just the sixth to vote for it. 
Found and installed. Unfortunately same restriction without a choice to switch comments off.
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Kind of funny behaviour with both scripts active. Though ‘Show recording comments’ is deactivated for your script the comments show up twice when displaying a release. After activating and deactivating again the second comments vanish. 
I’ll uninstall mordos’ script, I think. I don’t need its ‘google’ search functions.