System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92
Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-23 21:54, hash: rB49234c15e299
Worked: (newest version of Blender that worked as expected)
Short description of error
[masking glitch happening in todays build]
Exact steps for others to reproduce the error
[take a cube remesh it and use mask]
[Based on the default startup or an attached .blend file (as simple as possible)]