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“These cause the cells in your body to produce something for your body to attack - it’s not an external threat that’s being killed, it’s something your own body produced. “

That is correct. But these cells sprouting the spike proteins die (killed by the body’s own immune system). The key point is they are limited in number — and all of which will die — and the change is not hereditary. The spikes won’t be passed down to succeeding generations because there is no genetic/DNA alteration.

Yes, but my point is that this is where there's tons of potential for confusion - your body might recognize those fake virus cells as a part of your body, and decide the spike protein is ok. Or perhaps recognize the other parts (not just the spike) of that cell as an invader - parts that are shared by other things inside you that you don't want to be killed off.
But why would the body stop producing them? Unless some other mRNA is sent to the cells, won't they keep producing the fake virus nonstop? Sure, eventually your body will reprogram those cells back to what it actually needs, but not every fake virus producer may get changed for a long while. And what happens if your body detects that certain cells are creating the virus it's defending against? Possibly attack every other cell that produces stuff?