Operating system: Darwin-19.5.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5500M OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.9.15
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-14 20:45, hash: rBd493fc43bd4a
Short description of error
When returning to an open instance of Blender from other application, Blender (often) crashes immediately. Happens with multiple files (of a certain complexity?).
Exact steps for others to reproduce the error
Open attached file. Switch to other app without closing blender. Return to Blender: Crash.
Full error report: