I'm not a medical authority, but I would have to say that something is lingering there in that damaged area, and it could very well be a slow bleed. However, the DOACs like Eliquis and Xarelto don't stop the clotting mechanism. They retard, or delay it. The idea is that simply delaying the onset of a potential clot in the Left Atrial Appendage (LAA, where most of the risk for clotting during AF lies) helps to reduce the risk of a clot forming during an arrhythmia and then becoming dislodged when the heart resumes normal sinus rhythm (NSR) and the stronger flow of blood make the clot spring loose.
I do think your medical expert advisor should know about this, or be advised if that person doesn't know yet. You may need an MRI or something to image that area to see how the tissues are holding up with the DOAC active nearby.