I had similar situation a couple of days ago. We were rerouted due to cancellation after we’d checked in, so getting bags to follow us was always going to be a challenge. When we arrived at ABZ no bags.
We reported missing bags at desk and they said the system showed bags at ORD and then blamed AA for not rerouting them.
Overnight the World tracer system updated to show that bags were actually on the way and had indeed followed us and had never been to ORD. They were delivered later that day, which being New Year’s Day here in Scotland was exceptional service. ��
During all this time the BA tracker page showed still searching for your bags. Clearly there is more than one system in play here and there are issues with communications between them.
I guess the crucial issue here is to reunite pax and bags ASAP, which in our case they did very well!