Hey @rory.street,
We are looking into this. Looks like this is only still happening with the /wc path. As an alternative you can use the /j and /s for embedding meetings in iFrames. This might require a few extra clicks for your users, but should be a workaround until we get /wc working again.
To Start Meeting:
https://zoom.us/s/meetingID
To Join Meeting
https://zoom.us/j/meetingID
Will get back to you asap once our engineers have taken a look.
Thanks,
Tommy