Empty Rules With Border-Radius And Calc Function

[v-nalabr]

I noticed that this tool fails in some cases when a calc() function is passed as a parameter to border-radius.

For example,
.class {
border-radius: 0 0 calc(0.25rem - 1px) calc(0.25rem - 1px);
}

Becomes:
.class {
border-radius: ;
}

Is this a known issue?