Query with $in and pointer field


I want to build query with where clause which uses data from array. For this I plan to use $in operator. The problem that when I use $in query gives no records.

Where clause bellow works perfectly:
{"ActionPointer":{"collName":"Actions", "_id":"53faf8d5e4b003453216fc59"}}}

Where clause bellow (which to my understanding is the same as above) gives no records:
{"ActionPointer":{"collName":"Actions", "_id":{"$in" :["53faf8d5e4b003453216fc59"]}}}

Is that my some mistake or is there any other way how to use $in operator on pointer values?

Best regards,
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