**System Information**
Operating system: Linux-5.11.0-27-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.57.02
**Blender Version**
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-08-23 05:08, hash: `rB0682af0d63a4`
Worked: 2.93.3
**Short description of error**
Using the Dopesheet completely messes up the handles and positions of keyframes even on the most basic edits. Graph Editor is alright. This is a major showstopper I guess.
**Exact steps for others to reproduce the error**
- Open attached blend file (or quickly set 2 keyframes on the default cube and open the Dopesheet)
{F10310401}
- Move some keyframes in the Dopesheet. Even if you right-click to opt out of the editing operation the handles and positions of the keyframes get totally messed up.
Demo video, first using 2.93.3 where everything works as expected, 2nd half shows the same action in 3.0 master where things break:
{F10310449}