Reset mac-caching on capsman

Hello,
is there any way to reset mac cache within capsman?
Here is what I’m trying to achieve:

I’m using radius auth and would like to use mac-caching to improve reply speed when clients move between different APs managed under same capsman.
If client tries to connect BEFORE I’ve enabled his mac addr on radius, capsman receives (and caches) a KO.
After that, even if I add the MAC address to radius, I’m not able to login because (I think) capsman has cached the KO. I assume I’ve to wait until KO has expired.
Of course, disabling mac-caching solve the issue… I also tried disabling mac-caching, then connecting (OK) and finally re-enabling mac-caching. As soon as I enable mac caching, it “remembers” the previous KO.

Thanks