对 PyQt 邮件列表的回复指出设置此 env var 有效:

A reply to the PyQt mailing list pointed out that setting this env var works:

QT_MAC_WANTS_LAYER=1

通过https://forums.macrumors.com/threads/pyqt5-and-big-sur.2260773/?post=29243620#post-29243620