MongoDb and Golang - $group and $match

I am trying to $match my data after $group but it does not work.
I have db with jobs.
Every job has {id, batchId(a few jobs can belong to one batch), createdAt, finishedAt}.

I cant understand why I am getting empty result. I need to get the groups of the jobs with the same batchId that were created before CreatedAtTo parameter.
For saving date I used unix timestamp (so it is an integer)

My solution:

group := bson.M{
	"$group": bson.M{
		"_id":   "$batchid",
		"btime": bson.M{"$max": "$createdAt"},
		"doc":   bson.M{"$push": "$$ROOT"},
	},
}

match := bson.M{
	"$match": bson.M{
		"btime": bson.M{
			"$lte": CreatedAtTo},
	},
}

sort := bson.M{"$sort": bson.M{"btime": -1}}
limit := bson.M{"$limit": 1}

pipeline := []bson.M{group, match, sort, limit}

If I comment $match part it works, but not all together. And tried to perform in robo 3t. It works as well

	db.getCollection('jobs').aggregate(
	[
	{$group:{
		"_id":"$batchId",
		btime: { $max: "$createdAt"},
		bItems: { $push: "$$CURRENT" }
	}},
	{$match:{"btime": {"$lte": 10}}},
	{$sort:{"btime": -1}},
	{$limit:1},
	])

Am I missing something ?

It should work, make sure all your field is a valid date or use $toDate

db.collection.aggregate([
  {
    $group: {
      _id: "$batchid",
      btime: {
        $max: "$createdAt"
      },
      doc: {
        $push: "$$ROOT"
      }
    }
  },
  {
    $match: {
      btime: {
        $gt: "2021-07-01T11:23:25.184Z"
      }
    }
  }
])

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