I joined the TGIF ride tonight. After a few minutes my computer froze, but I blame my machine for that. I restarted the computer, reloaded Zwift, and rejoined the ride. My jersey changed to the group jersey, I landed in the pack near the leader.
At the first turn the group encountered after I rejoined, the group made the turn but I went straight.
I got out of Zwift, restarted, and rejoined the ride again. Again I did not turn when the group turned.
I have rejoined group rides in the past with no problems.