AiP x leasehold (instead of share of freehold)

Hello! We are in the (long and tedious) property purchase process. Long story short: the property was advertised as a share of freehold, but then the solicitors found out that it is a leasehold (with a very long lease) instead. Will this affect our mortgage agreement in principle? I am flagging this to our broker tomorrow, just want to know what to prepare myself for. Thank you!