I don't have any scientific papers, but I can tell you it's frequent to read in the local newspaper here (east of France) about some cardiac problem on amateur football (soccer) fields.

The last I read last week the guy's heart stopped 2 times before he could be rushed to the hospital.

There's also a list that is circulating on social medias of celebrities that had problems after their vaccines.

Is it linked? I don't know, but before the vaccines these kind of problems were almost unheard of.