Failed to run explain: Internal error in Compass

Working with Data Developer Tools
,
1

I have created an aggregation-pipeline with this as match stage in Compass:

{
  $and: [
    {
      isTrue: false,
    },
    {
      email: {
        $ne: "some-email",
      },
    },
    {
      $expr: {
        $eq: [
          "$namespace",
          "some-namespace",
        ],
      },
    },
  ],
}

When I run it with explain it throws an “Internal error”, when I run it normally, it works.

If I replace the $expr with:

{ namespace : { $eq : { "some-namespace" } }

the explain command works.

Why doesn’t it work with $expr?
Are both variants the same?

2

After adding a $limit stage, the explain command works again