Nested comment blocks {{! ... {{! ... }} ... }} do not work as expected

[DilumAluthge]

Minimum working example (MWE)

import Mustache

template = Mustache.mt"""
    Hello.
    {{! Foo.  {{! Bar. }}  Baz.}}
    Goodbye.
""";

Mustache.render(template) |> println;

Expected output:

I would expect that Mustache.render(template) |> println would print out the following:

Hello.
Goodbye.

In other words, I would expect that everything inside both the "outer" comment block and the "inner" comment block would be removed.

Actual output:

julia> import Mustache

julia> template = Mustache.mt"""
       Hello.
       {{! Foo.  {{! Bar. }}  Baz.}}
       Goodbye.
       """;

julia> Mustache.render(template) |> println;
Hello.
  Baz.}}
Goodbye.

Version info

I tested this using Julia 1.10.5 and Mustache.jl v1.0.20 on macOS.