ASM and WebAcceleration Cache

WebAcceleration cache doesnt cache pages when the ASM is enabled on the VS. I've followed : https://support.f5.com/csp/article/K17707311

irule is simple:

when HTTP_REQUEST { if { [matchclass [HTTP::path] ends_with CachedItems_MaxAge] } { log local0. "Matched MaxAge Cache" CACHE::enable log local0. "after cache" } }

I can see that it is matched and i can see log local0. "Matched MaxAge Cache" and log local0. "after cache" are hit but it just doesnt cache the page.