To fix it, I would try using NRaas Debug Enabler, if you have it installed. Click on the probelm tree, choose Nraas - Debug Enabler - Options: Money Tree - Object - Reset. I have not had this exact problem with a money tree but I have unstuck other plants, mailboxes, beds, pianos, all sorts of messed up objects using this mod. Careful with this mod though, it allows access to some EA dev functions that can really mess things up in a game. Resetting an object is pretty straightforward though.
Another thing to try, if you're using the Swiftgrow Garden Station, is to use it with three sunlight balls to cause all plants in the radius to cycle to their next growth stage. It won't make them produce moneybags right now but it may flip them to the next stage, effectively resetting them. I'm a swiftgrow gardener myself and, other than the Identify Seeds function, it's been problem-free for me.
I would suspect that this was caused by the dragon.