Similar nonzero observations have been made in other national studies with sufficiently large samples.[1]
Some countries have added additional content around it to the prescribing info [2].
Scientific consensus is that the risk is clearly is lower than covid.
Another rare but acknowledged side effect is mycarditis.
We can quibble about the rates but they do exist.
https://www.thelancet.com/journals/laninf/article/PIIS1473-3...
https://healthycanadians.gc.ca/recall-alert-rappel-avis/hc-s...
https://www.aappublications.org/news/2021/06/10/covid-vaccin...
An analysis looking at the trial data puts it at 14-18/100k higher than the expected baseline
https://www.thelancet.com/journals/laninf/article/PIIS1473-3...
A analsys from the previously linked lancet study had a muck larger sample ~500k, but different collection methods and found smaller but nonzero results
>The age-standardised difference for the incidence compared with the background population was 41·5 (95% CI 11·7 to 71·4) for CoronaVac and 17·0 (−6·6 to 40·6) for BNT162b2, equivalent to an additional 4·8 cases per 100 000 people vaccinated for CoronaVac and 2·0 cases per 100 000 people vaccinated for BNT162b2.
Most if not all the vaccine trials saw small increases <1% in serious adverse events in the treatment arm
is all your evidence for a non-negligible cost this flimsy?