Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.48
Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: rB239fbf7d936f
Short description of error
When I use this symbol: \ in the name of custom property here it makes a problem: I can't see data of the property as you can see on the screen (IK\FK). Also, If the same symbol is in the name of constraint it also cause problem: I can't add driver to the influence of constraint. But there is no such problem in the tutorial. Also I use Bone Layers add-on, but it's also used in tutorial and there is no any problem.
Exact steps for others to reproduce the error
Just add the slash in the name.)
PS: It's not very important to me, I just deleted the \ but I guess it can be useful for you to improve Blender.)
Thank you a lot.