AH00124: Request exceeded the limit of 10 internal redirects due to probable configuration error, how to fix?

Question

htaccess

Error AH00124: Request exceeded the limit of 10 internal redirects due to probable configuration error

Ubuntu 20.04
Apache 2.4.41
PHP 7.4

My .htaccess

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)$ /index.php?action=$1 [L,QSA]