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Antihelium is very rare. There is a video here about antihelium detected above Earth's atmosphere.

Anti helium detected by the ISS

Decaying dark matter is one possible source of antihelium suggested in the video.But could quasars ot magnetars or even supernovae create antihelium?

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    $\begingroup$ Only detected tentatively by a single experiment. So, maybe not real. But consider that gamma ray bursts, another implausible phenomenon, took decades and many observations by a variety of experiments to (partially) unravel. $\endgroup$
    – John Doty
    Commented Oct 27 at 12:06

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