System Information
Operating system: Linux-5.11.0-7614-generic-x86_64-with-glibc2.32 64 Bits
Graphics card: Quadro RTX 6000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.73.01

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-24 11:38, hash: rB2b9ca0f112ad
Worked: before Cycles X merge (?)

Short description of error
Trying to save a bordered render as multilayer exr crashes Blender

Exact steps for others to reproduce the error

• make a region render
• try saving the render result as multilayer exr
• crash