Hyperlinks not working

[cooperteachermadrid-oss]

The hyperlinks leading to videos on YouTube (behind the UK/US flags in the PDF attached) do not work in Sumatra, however they do work when I open the PDF in Microsoft Edge.
Reassuring-a-Parent-about-a-Paediatric-Scan-by-Specialist-Language-Courses.pdf

[GitHubRulesOK]

Edge introduced their own hyperlinking system and am unsure if that will stay as many other experiments like epub reader and some other annotations were abandoned so there were 2 different attempts at epub reader and even PDF thumbnail previews a couple of times all now gone.

The address looks fairly conventional so may be the way they are embedded as that is less common
such links should raise hackles as not showing a potential PHISH exploit

@kjk these links are acceptable to MuPDF it shows the target before allow DoubleClick to launch browser

368 0 obj
<</Type/Annot/Subtype/Link/A 369 0 R/BS<</Type/Border/S/S/W 0>>/Border[0 0 0]/Contents/H/I/Rect[271.8 473.88 456.24 630.12]/StructParent 4>>
endobj

369 0 obj
<</S/URI/URI(https://www.youtube.com/watch?v=6qsk4tKIJXY)>>
endobj