WP_DEBUG must be on, otherwise edit post or page will show 404 error

Question

encountered a very strange error: my WP_DEBUG must be on (set to true), otherwise editing post or page at the admin panel will show the 404 error. While the save post/page can still be seen.

The wordpress version is 5.6.

What might be the underlining cause of this error? Has anyone seen this before?

Thanks a lot!

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user199004 1 month 0 Answers 6 views 0

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