Was it the theme that you updated that caused the issue ? In my tests on the duplicator package I saw that once I switched the theme then it works fine.
Secondly I see that the theme even breaks the default bootstrap accordion independently of our Toolset plugins. However can you confirm if it was the theme that was updated?
Yes, I think so. But it might have been affected by an update to wordpress version 5.8, or updates on WPML or Toolset around the same time. Sorry for the unclear answer. I've tried to backtrack my actions before the accordions stopped working, but can't say for certain. I definitely updated the theme though.
Given that this an issue with the theme I would recommend that you get in touch with the theme's support as this update from the theme breaks the bootstrap CSS for accordions. I suspect that its not only the accordions but all the toggle functions for bootstrap.
The theme author will need to look at this to come up with a fix given that we rely on bootstrap to do the accordions.