Had a quick look, If you look at the History for your Mast you will see All the Sectors on the Mast were discovered on 23 Sept 2022 and last Seen on the same day, which kind off tells me its only really seen a quick Drive Past and has not been surveyed since, so there's a good chance that the Mast has been updated or had added Bands / Sectors since then.
Also there is no 5G Mapping at all in the area, which is also another good clue that the Area hasn't been mapped for a while. why don't you Install Cell Mapper on your Device, do some Drive Arounds or Walk About on Cell Mapper, upload the Data, wait a few days and see what updates are available.
Also looking at the Mast (3 Pole of Wonder) I would say it is 5G (n78) enabled.