This issue has still not been resolved for me. Ticket submitted back in January (Ticket 159964) had some efforts from the support team regarding an updated firmware that did not resolve the issue. The cameras have since seen at least one regular firmware update with no change. Currently on 220.127.116.11
To clarify, for me, the problem is intermittent. It is however ALWAYS related to low bit-rate streams. For whatever reason when the camera bit rate drops below say 35-40 KB/s any triggered or manual recording exhibits the problem (fast playback and incorrectly reported duration). When in IR (night) mode bit-rates are normal and records are fine. I first thought it might be signal related as the problem was with two of my cameras that were farthest form the router, but this has not been consistently the case. Just today one camera was streaming at 130 KB/s+ and the one right next to it was at 20 KB/s. WiFi signal was 90% and 88% respectively. I am at a loss to try and explain this (as I think Wyze support is as well). Again the really weird part is the moment I switch to IR/night mode bit-rates pop up to normal (120 KB/s+) and records are played back just fine.