Yes well, ehm. I use the semware editor occasionally and when I paste from that into the studio I have developed a superfast backspace finger.
Because very frequently garbage appears in the end of what I paste, and I have only a few milliseconds to remove it before the Studio parses it. Because if I don't, then the whole Studio may be toast.
So, train your backspace finger.
BTW, should the Studio ever accept a character 0? No! So perhaps remove character 0 from pasted values too? Might fix it.