Run into same thing here. I have a feeling it's caused by talking to July about her. I did it before getting this stage of quest.
UPD You must call Gabe from library actually.
Turns out for me it changes to "ask around and apologise" when she brings the smutt book with her, so one dialogue group before asking her about astylian. And I can't ask Gabe about it at any point, tried during every step
