Just received the below , although my flight departs terminal 3

Dear Customer,
We’re sorry to let you know that an issue with the baggage system at London Heathrow Terminal 5 may affect your journey today. This means your checked bag may not be loaded onto your flight and could arrive later.

While this issue is with the airport’s baggage system and outside of our control, please be assured that we’re working closely with Heathrow Airport to minimise disruption and get your bag back to you as quickly as possible.