Operating system: Linux-5.8.0-7642-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce RTX 2070 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.39
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-08 10:14, hash: rBc33a3cfd9aab
Short description of error
Parenting a mask to a marker seems mess up the little mask center widget. When the mask has been transformed by the parenting to a track, I cannot grab the little white circle directly to move the entire mask, I have to click somewhere beside the widget to move the mask.
Open this file.
On frame 1 you can move the mask by clicking on the little white center widget.
On frame 4, where the mask has been moved by the track, you have to click in the upper right corner of the spline to move the mask.