Came here to report this exact issue and add a little more info.
Yesterday I arranged a “solo meetup” with "keep everyone together enabled and essentially, assuming a gradient of zero and power of 3.0+ w/kg, the rider gets a continuous speed boost of roughly 5 kph relative to a small group (with draft enabled) and around 6-8 kph compared to other solo riders!! Here is another strava example
You’ll note that the bug is even acknowledged in the discussion thread under the ride!
I didn’t have time to confirm whether or not the advantage is fixed or exponential relative to power, but the time I got for one Tick-Tock lap was almost identical to one I managed in a recent TT event…where I was averaging almost 150 watts higher!! Please investigate and fix this issue since there already appear to be a bunch of people knowingly exploiting it to obliterate legitimate KOM times earned in races, TTs, solo rides and group events, and once the times are uploaded, I very much doubt anybody will voluntarily flag or delete them!