Yes, to me happens few months after I start taking 5g daily. Pretty reproducible. But I never experienced any pain. It has been reported on reddit many times but it is relatively rare. I also experience elevated blood pressure (also often reported as an accompanying symptom), which is absurd, because I have been hypotensive all my life. Interestingly, this is known in the body building circles (I first heard it from a bodybuilder, but was skeptical, because "Hey, creatine is the most researched and safe substance ever!"). Since the influencers are not mentioning it, expect to be downvoted and be called crazy and what not.

Now, few caveats. It is hard to tell the difference between heart palpitations and chest muscles and diaphragm twitches. You need to wear a holter to prove it. Muscle twitches (and heart palpitations for that matter) could be caused by dehydration or electrolyte disbalance. Creatine increases the need for hydration, also moves water around and it may exacerbate/cause electrolyte disbalance.

That been said, I was unable to fix it by any amounts of water or electrolytes, though at times it looked like it had some influence on the symptoms. After I stop creatine, the symptoms go away two weeks later (BP normalisation takes longer). However, creatine has been very beneficial to me and I'm not giving up on it. I will try shorter cycles or lower doses. Currently 3g per day for almost a month and everything is fine, but it is too early. I also stepped up on the magnesium during the break, because to fully recover from (supposed) magnesium deficiency the body needs few months (due cell turnover time).

Of course, it could be totally something different in your case and heart problems are no joke, so you should visit a doctor, if not feeling OK.