Yes, I think the key difference in conventional vaccines and mRNA vaxxes is that in conventional vaccines, they body normally completely clears the virus particles from the vaccine and is left with antibodies.

In the mRNA vax, the body keeps making new virus spike protein and also has the antibodies. This means that as soon as the immune system is triggered via those antibodies, it finds that the body is full of bits of virus (spike protein) and mounts an autoimmune attack. This can happen when a similar virus infects the person later.

It is an obvious failure mode of mRNA vaxxes. It is by design that they fail like this.