Extend all replacement in nested selector :not() does not work

[SomMeri]

Extend all does not replace inside pseudoclasses such as :not.

Sample input:

a:not(tag1) {
    property: value;
}
replacement1:first:extend(tag1 all) {}

less.js output:

a:not(tag1) {
  property: value;
}

expected output:

a:not(tag1),
a:not(replacement1:first) {
  property: value;
}

[SomMeri]

Longer test case:

a:not(tag1) {
    property: value;
}

a:not(tag1:last) {
    property: value;
}

tag1:first:not(tag1:last) {
    property: value;
}

replacement1:first:extend(tag1 all) {}

less.js output:

a:not(tag1) {
  property: value;
}
a:not(tag1:last) {
  property: value;
}
tag1:first:not(tag1:last),
replacement1:first:first:not(tag1:last) {
  property: value;
}

expected output:

a:not(tag1), 
a:not(replacement1:first){
  property: value;
}
a:not(tag1:last),
a:not(replacement1:first:last) {
  property: value;
}
tag1:first:not(tag1:last),
replacement1:first:first:not(replacement1:first:last) {
  property: value;
}