System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.49
Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: rBe05e1e369187
Worked: (newest version of Blender that worked as expected)
Short description of error
Saving an empty slot when setting a material goes into a real empty slot for the result
Exact steps for others to reproduce the error