Tabular parser: multiple instances of different classes do not work

As I illustrated to @amgo, I can now use the functionality developed after #1287 (closed), if we have multiple instances of more than one class in the row, it is not working.

I attach example files. You need to navigate to the path data/GrowthRun/GrowthRunStep/purge/GasSource

As you can see, the Bubblers class has two instances and the GasSource is supposed to have the same, but it is not

base_classes.schema.archive.yaml

Parma_datafile_nomad.xlsx

test.schema.archive.yaml