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Tested with version 2.14.1 and LINQ provider V2.

Given the class:

public class TestClass
{
  [BsonElement("_p")]
  public string Property { get; set; }
}

This query:

var queryable = collection.AsQueryable() .Select(x => new TestClass{ Property = x.Property.ToUpper() });

is handled correctly and produces the following MQL request:

{ 
  "aggregate": "coll", 
  "pipeline": [{ 
    "$project": { 
      "_p": { "$toUpper": "$_p" }, 
      "_id": 0 } } ], 
  "cursor": {} }

While this query:

collection.Aggregate()
  .Project(
    Builders<TestClass>.Projection
     .Expression(x => new TestClass { Property = x.Property.ToUpper() }));

give the wrong query (still refers to attribute as Property:

{ 
  "aggregate": "coll", 
  "pipeline": [{ 
    "$project": { 
      "_p": { "$toUpper": "$_p" }, 
      "_id": 0 } } ], 
  "cursor": {} }