**System Information**
Operating system: Linux-4.15.0-156-generic-x86_64-with-glibc2.27 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 5500 (BDW GT2) Intel Open Source Technology Center 4.6 (Core Profile) Mesa 20.0.8
**Blender Version**
Broken: version: 2.93.5 Release Candidate, branch: master, commit date: 2021-09-06 07:37, hash: `rB597d9518efff`
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-16 23:23, hash: `rBa1c65748c40d`
Worked: (newest version of Blender that worked as expected)
**Short description of error**
Hi I don't even know how to classify this bug, I have a mesh that has two different materials assigned and I can't remove one, so even if I assign a new material it keeps the information of the old materials and I can't even remove one so it makes it impossible for me to be able to assign now another material because it continues to keep the information of the previous assigned material.
And this is the video
{F10443781}
**Exact steps for others to reproduce the error**
I am attaching the file because I don't know how to reproduce this error.
{F10443804}