I just checked: the code here deliberately splits the strip in half if the cursor isn't inside the strip. So, technically, it's working "as intended".

So, clearly this isn't working as you'd expect. To determine what (if anything) needs to happen here, could you explain:

• What would you expect to have happened instead?
• Why is the current behaviour not good for your workflow?

I thought the correct behaviour would be not to split selected strips at all if the current frame is "outside".

(background was: unintentionally split up several strips after forgetting to unselect them, which was hard to fix as there seems to be no 'join strips' function)