Can't open attachments (front office) when module activated

[setecastro]

Did you observe this problem anywhere?
As the .htaccess is almost the same when activating the module, I don't see where it can come from.
I tried to put these lines in the url blacklist but without any success :
/index.php?controller=attachment&id_attachment=*
/fr/index.php?controller=attachment&id_attachment=*
/en/index.php?controller=attachment&id_attachment=*

 

[Pong]

It doesn't look like LSCPS related since LSCPS won't write such to .htaccess.

 

[setecastro]

The parameters ctry and lang in Context Vary Bypass fixed it, thanks to support@litespeedtech.com