I have a feeling your updates have always been broken. Since the beta acts a different way, you were able to install those, but now the beta has ended, your broken updates have returned.
Usually this is caused by the phone being second hand or imported to the uk. The original country of the phone not matching the uk or using a non uk sim card.
Usual fixes are get a cheap sim for the original country of the phone.
Use smart switch on a pc to try and update it.
Last resort, use smart switch to wipe it and install the latest software on the phone