weapon bays open while taxiing

In this latest video published by the 388th, at 2:59 mark, you will see them taxiing back to base after a training mission with their bays opened. I don't remember ever seeing the Raptors did that. Any insight as to why ?

https://www.facebook.com/388fw/videos/114005600525020/

Following video says "Good Morning PANTHER NATION". Last F-35A taxiing back in video under question had weapon bay doors closed. A possible answer for doors open taxiing is for cooling OR to show weapon bays empty for ground crew? ????

388th & 419th FW F-35A 'Panther Nation' HILL AFB https://www.youtube.com/watch?v=8YzQvQQnMgY

I'm opting to your second point. To have access and make sure munitions aren't unintentionally left on the plane.

Hill AFB, ground crews wearing jackets...not likely a cooling issue. Also, this appears to be post-landing, and near the parking apron — meaning they’ve been thru the de-arming area. Jet with doors closed may not have had any ordnance in the jet.