Really? Not sure this is entirely accurate. In East Yorkshire and Lincolnshire, it’s the local weather and a full close before returning to the network forecast. Last time I saw Yorkshire, it was local forecast followed by weather summary before handing over to the network forecast (“the national forecast follows”).
Yorkshire and Yorks & Lincs are two different regions. This is odd though, as they share the weather presenters - that's why Look North Hull's weather forecast is in the middle of the 6.30pm programme instead of at the end.
Breakfast 'local' bulletins are shared between the two still I think? Produced from Hull.
The retrograde step of re-merging the breakfast bulletins happened after years of separate Leeds/Hull breakfast bulletins, I'm sure.
Why this occurred (and why from Hull, considering that the original pan-region was always based in Leeds), who knows?
I thought at the time that it would either be a short-lived experiment or was testing the water for e.g. scaling back the Hull edition to a sub-opt (à la South Today from Oxford). Clearly not.
For non-news regional programmes (e.g. Inside Out, Sunday Politics, Late Kick-Off when that was still a thing) the original pan-region has never been split. I think the same applies to any occasional ad-hoc regional opt-out programmes across the whole of Yorks & Lincs?
I'm still a European.