Query result is not correct

[Fact]
public async Task Test()
{
    // count is 20
    var all = await  DB.Find<CNCPartCost>().Match(it=>true).ExecuteAsync();
    // count is 1
    var filterRes= all.Where(pc =>
        pc.Steps.Count > 0 && pc.Steps.First(s => s.Status == CNCPartCostStatus.Quoted).Time != null).ToList();
    // count is 0
    var res =await  DB.Find<CNCPartCost>().Match(pc =>
            pc.Steps.Count > 0 && pc.Steps.First(s => s.Status == CNCPartCostStatus.Quoted).Time != null)
        .ExecuteAsync();
    // count is 0
    var res2=DB.Collection<CNCPartCost>().Database.GetCollection<CNCPartCost>("cncPartCosts").AsQueryable().Where(pc =>
        pc.Steps.Count > 0 && pc.Steps.First(s => s.Status == CNCPartCostStatus.Quoted).Time != null).ToList();
}

Under normal circumstances, the results of filterRes、res、res2 should both be 1，and when i check the query log from mongo,i get this:

I found that the converted pipeline code is not consistent with my linq code，did I do something wrong?

one data that should be returned:

[li-zheng-hao]

Wow, very nice solution! thank you very much for your help! I will take the time to read the relevant information

[li-zheng-hao]

if not solved in latest version, can you pls provide a repro that i can just copy/paste and debug?

Yes, if I find that the result is the same after the upgrade, I will write a minimal reproducible sample code and submit it