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I face the same issues.
same thing with Chinese characters.
Hi @frogdogtech @ropezg
Please disable the advanced char string filter.
WP Security > Firewall > Addition firewall rules tab. Enable advanced character string filter :uncheck the checkbox and save
It might be due to after 5.2.2 It has been moved PHP based firewall rules so it might be the reason.
Regards
that worked, thank you!
another issue I noticed with the latest update is that cookie based brute force login prevention is not working (it keeps redirecting to 127.0.0.1). however the Rename login page works as an alternative
Can also confirm disabling Advanced Character String Filter fixed the issue in 5.2.4.
Appreciate the hasty response!