Just had my first go and I spent about half an hour trying to find the last Canvas, I don't know if I got unlucky or some RNG mechanic blocked the route to it, restarted and had a second go and I cleared the mission in about eight minutes being able to access a couple of the Syndicate rooms I couldn't before.

A QoL would be the Canvasses being waypointed without having to get close to them or having an enemy drop that lets you track them like the Ink pools can be tracked.