BTW, that same bug hit me but the problem was not a bad font, but a duplicate font which seems to confuse Qt. It turns out I had a local Arial font file and a local Times New Roman font file but Sequoia installed a system version of Arial and of Times New Roman with lots of unicode code points added to each of their versions.
With Apple's FontBook I was able to detect the duplicates and remove/disable my own local copies of Arial and Times New Roman and everything Qt started to work again.
So look out for font duplicates as well. If in doubt, disable your local font files.
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