Problem using BrowserTrix Crawler on a Linux Mint box to archive site which use js Lightbox and similar

I’m using a BrowserTrix Crawler instance under Docker and find it generally works well. The only issue I can’t figure out is that my test sites use JScript to display thumbnails which a user can click on to load a full size image.

If I ‘replay’ the generated wacz file it replays fine but if I click on a thumb I get a 404 for the larger image.

If I open the wacz in a Python tool I wrote I can confirm that the larger image is not being captured.

I’ve tried the ‘autoclick’ CLI option but this does not fix the issue.

Any suggests as to where to look next please?

Thanks.