When using the givewp plugin and the bogo (multilingual) plugin, there is a problem with givewp forms not displaying when switching languages. This is because the multilingual plug-ins cause https://test.com/give/xxxがhttps://test.com/en/give/xxxに書き換えられてしまうため and 500 errors.
To solve this problem, there is a way to rewrite the .htaccess. Specifically, add the following code to your .htaccess file. Note that it is important to make this addition above “# BEGIN WordPress”.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^en/give/(.*)$ /give/$1 [R=301,L]
</IfModule>