It appears to be due to the sad death of the landlord: https://www.lancasterguardian.co.uk/lifestyle/food-and-drink/tributes-paid-after-death-of-popular-lancaster-pub-landlord-5405688

Temporarily marked as disused with a lifecycle prefix in https://www.openstreetmap.org/changeset/175112182. Hopefully it’ll be back open soon and StreetComplete will prompt to re-survey it as per the check_date