This is not a big deal but is annoying like real bugs.
If I have a note that ends with a $$ environment, for example:
This is $\Psi$
where $ is the last character. Then it is displayed fine in the WYSIWYG editor as a Greek letter, but if you try to click next to it to put a cursor there, you can't! The last position you can click to is just before the $$ environment. Then you need to manually hit the keyboard and move the cursor to after the $$. For those typing a lot of special characters and formulas, this will be really disruptive.