Just very burned out, it turns out (apparently six months of [now-sorted] consistent hobby-level stress and going on three months of [in the process of being sorted] work-level stress will do that to you).
This weekend is set aside for trying to get back into the swing of things writing-wise, so hopefully that chapter will be out sooner rather than later, but I’m not going to burn my brain and body out any more than they already are to force things to happen.