Reportedly, older KVM/Qemu instances indeed do use 54:52:00:*,
so add this as an alternative.
ENV{MATCHIFTYPE}="$attr{type}"
# ignore KVM virtual interfaces
ENV{MATCHIFTYPE}="$attr{type}"
# ignore KVM virtual interfaces
-ENV{MATCHADDR}=="52:54:00:*", GOTO="persistent_net_generator_end"
+ENV{MATCHADDR}=="52:54:00:*|54:52:00:*", GOTO="persistent_net_generator_end"
# ignore VMWare virtual interfaces
ENV{MATCHADDR}=="00:0c:29:*|00:50:56:*", GOTO="persistent_net_generator_end"
# ignore VMWare virtual interfaces
ENV{MATCHADDR}=="00:0c:29:*|00:50:56:*", GOTO="persistent_net_generator_end"