Just to warn everyone, Double Span Spin will glitch and freeze for all riders if you’re doing a meetup. This happens between mile 1.1 to 1.3 and will last about 2-3 minutes. If everyone keeps pedaling, the avatar will move forward in tiny bursts at 1-2 mph until you pass that 1.3 mile mark (aka: when you finish rounding the bend and get onto the brickwork vice the tarmac) and you will be able to get back to speed.
This happens at the exact same point every time if you’re doing a multi-lap meetup (happened against at mile 5.6-5.8).
This does not happen if you free-ride the route, though - I verified that by doing a lap after the meetup was over and made it through the afflicted region without issue.
Yes, I’ve emailed Zwift Support. Hopefully they rectify this soon.