security headers disappearing

Although I use LScache plugin, Really simple SSL always shows a message on the backend dashboard explaining that no cache could be found. But the htaccess begins like this :

#BEGIN LSCACHE

##LITESPEED WP CACHE PLUGIN – Do not edit the contents of this block!
RewriteEngine on
CacheLookup on
RewriteRule .* – [E=Cache-Control:no-autoflush]
RewriteRule litespeed/debug/.*.log$ – [F,L]
RewriteRule .litespeed_conf.dat – [F,L]

What is missing ???? Is Really simple incompatible with LSCACHE ?

Thank you for your help

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