According to Einstein's mass energy equivalence equation,
$$ E = mc^2$$
where $m$ is the rest mass and $c$ is speed of light.
According to Planck's equation,
$$ E=hv$$
If Planck's equation suggests that energy can only come in discrete packets, and if mass is equivalent to energy, then wouldn't this mean mass only comes in discrete packets?
I saw this post and I found one answer discussing my question, however it was downvoted with no explanation on why it's wrong. The accepted answer's give evidence for why it should be the case that mass is continuous, however, there are a few 'downvoted' answers which suggest the idea I said before and have been downvoted. So, I'm trying to understand why exactly those answers are wrong.
Edit: The answer where I saw it in , see answer by user "howyoudoin" and by user "hhh",