"EU marriages will fall into the sham marriage referral and investigation scheme."
Appalling, I think, but a fairly inevitable consequence of Brexit if one aim is to reduce EU/non-EU distinctions of citizenship.

It was always stated that one intention of Brexit was to stop giving preferential treatment to EU citizens when compared to the rest of the world. This just standardises that treatment. It just means that people coming from EU to marry in UK will be checked by the Home Office, as currently happens with citizens of America, Armenia, Australia and over 100 other countries in the same circumstances.

Details per HM Government are Here