Operating system: Kubuntu Linux 18.04
Graphics card: AMD Radeon R9 290
Broken: 2.61, 2.70, 2.79 release, 2.80 release, daily build 2.81 Alpha, 1eead85cdc27, 2019-08-08
Short description of error
Bendy bones sometimes cause "exploding" mesh deformations when armature modifier flag "Preserve volume" is on. But deforming Bendy bone itself not shows any anomaly.
Exact steps for others to reproduce the error
Launch animation playback. Text block inside also has description.