Undo has an interval within which it won't be registered

I just realized that Unity Editor's undo has a bug. If you try to click a toggle/checkbox multiple times very fast (in any regular Unity inspector), the undo will be registered, but in a kind of "blank state", and then won't work correctly.

I realized this while working on one of my custom panels. I initially thought it was an error in my code, but then found out it's a Unity's bug, since it happens with its own panels. This seems to point to the fact that there's a gap between when an undo can be correctly registered.

Anyone has more infos on this? And if there's any workaround?