Mapping a query dataset with new cell types with a labeled reference

[ashcpie]

Hello Satija lab,
Thank you for your great work!
I mapped my data to a labeled reference dataset in Seurat 4.0. I followed the steps in "Mapping scRNA-seq queries onto reference datasets". Some cell types in my query dataset should not be in the reference dataset(such as tumor cells), and I hope I can identify these cells in the mapping results. However, the result seems like that all the cell labels in my query datasets were appeared in the reference dataset.
My question is: Will cell type labels in the query data set be consistent with those in the reference dataset, even if the cell types are not actually the same? If there are new cell types in there, what can I do with current pipeline?