Not Equal modifier not working

[dsandros]

Using the below query I get the expected results, but when replacing == with != it breaks and includes all SnapshotId's. Using != to fix parsing error. Snapshots[?Tags[?Key=='Migration']].SnapshotId

I am able to get expression working correctly with the following but does seem like an extra step. Snapshots[?!not_null(Tags[?Key == Migration].Value)].SnapshotId