The similar thing: my ticket is “Critical Error after updating to WordPress from 5.5.3 to 5.6” https://core.trac.ww.wp.xz.cn/ticket/52114 and https://ww.wp.xz.cn/support/topic/critical-error-after-updating-to-wordpress-from-5-5-3-to-5-6/
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This reply was modified 5 years, 5 months ago by theuseful.
Similar thing with WP-admin. Described here https://core.trac.ww.wp.xz.cn/ticket/52114
