I'm so sorry to read about Stubbs. Wishing you lots of care and love during this hard time and now holiday season. We all know what it's like to lose a pet and around the holidays, well I will just send all the good vibes as much as I can.
I am taking his body to my vet today. My vet is going to use him to learn how to help other beardies and find what to look for physically.
If he finds anything super interesting I will let you all know! The more people that know about heart disease in bearded dragons, the better we can treat them in the long term.
I feel like its what Stubbs would want. He was always a trooper and helped so many people get over their fear of reptiles and helped so many beardies get the home they needed.