Im not quite sure if this is a bug that is fixable, but this has been happening to me for AGES
When my studio freezes once I open a solo session, sometimes I spam the Stop button, as shown in the screenshot below.
However, once studio unfreezes the stop button is replaced with the “Start local server session” button, and the inputs would register at that position, which starts a local session.
I’ve attached a video of this happening. You can see that once my studio unfreezes, all inputs are finally registered at the position where the stop button originally was, which starts a local server session. (This almost crashed my PC)