Fastest Cache wp-content/cache/all/*/index Issue
If the URL Redirection terminate with an ‘index‘ then the Problem should be caused from a .html Redirection Rule Like here Below.
RewriteCond %{REQUEST_URI} \.html$ RewriteRule ^(.*)\.html$ $1 [R=301,L]
You have just to Implement the Rewrite Rule in this Way:
RewriteCond %{REQUEST_URI} !cache/all RewriteCond %{REQUEST_URI} \.html$ RewriteRule ^(.*)\.html$ $1 [R=301,L]
Whit this URLs Containing ‘cache/all’ are Not be Modified!