update Attack signature not staging

I upgraded F5 LTM+ASM from v.11.5.1 to v.11.5.4 hf2.

 

After upgrade I enabled Place updated signatures in staging and updated signature.

 

After update signature I found attack signatures not in staging

 

I tested by generate some url to see signature behavior and found that was blocked by new updated attack signature.

 

I think new updated attack signature should not block.

 

Why new updated attack signature not in staging?

 

Thank you.