interface-mac-limit does not work in 18.4R1?

Hello!

On our QFX5100 boxes we're using the following SP-style configuration to limit max. MAC addresses on interface:

minotaur@asw1-sp.ki# show vlans PUBLIC switch-options interface xe-0/0/0.777
interface-mac-limit {
1;
packet-action drop-and-log;
}
static-mac a0:36:9f:73:0f:02;
no-mac-learning;

It works fine on 17.2R3.4 and 17.4R1-S3.3. But support in 18.4R1.8 looks broken:

minotaur@asw3-sp.ki# show vlans PUBLIC
##
## Warning: Interface mac limit should not be configured at VLAN level for sub interfaces
##
interface xe-0/0/47.777;
interface ae0.777;
switch-options {
    interface xe-0/0/47.777 {
        interface-mac-limit {
            1;
            packet-action drop-and-log;
        }
    }
}

I was not able to find any other place to configure MAC limiting. Any ideas are kindly appreciated! Thanks!