I have a long numbered-list with >200 elements. The list is not nested, and does not have anything out of the ordinary (no mixed list types: no bullets, no checkboxes).
On the markdown editor the list displays fine.
On the rich-text editor 100th item is displayed as 00, 101st as 01 and so on. The numbers seem to lack a 3rd digit.
I remember seeing this before at some point, the numbers are actually there but the first digit has been pushed over so it isn't visible.
If I add margin-left: 50px to .mce-content-body just to prove the fact, you can see that the left digit shows up and how it is hidden within the margin usually.
I don't remember if there was ever a consensus on this as to how it should behave (i.e if there was a good reason to only display a max of two digits on screen) or if an issue report was created.