If your website won't load after updating to BuddyPress 12.1.1 it is likely a conflict with bbPress or another BuddyPress compatible plugin. Install the BP Classic plugin to fix this issue.

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Does the theme support Cyrillic or Georgian characters?

There may be some conflicts with the custom post type options and these characters. To fix this use the https://wordpress.org/plugins/cyr3lat/ plugin to convert Cyrillic and Georgian characters to Latin.