Why MLAT-Client MMD OY-CLZ blocked?

Hello,

is it an error or why MMD ATR72 OY-CLZ is blocked in MLAT ? Fr24 display normal MMD ATR72.

Is there a offical Aircraft List for with codes that block by MLAT-Client?

Kind Regards

EDDH

It’s crazy that so many civil aircraft are in the blocked list, but there are many military transporters and Police aircraft not blocked!

Even more bizarre that some airlines have some of their fleet blocked and some not blocked and some aircraft are blocked on one site and not on another!