Create copy of query before modifying.

Author: tsalo

src/smriprep/utils/bids.py

@@ -76,6 +76,7 @@ def collect_derivatives(
     for _space in std_spaces:
         space = _space.replace(':cohort-', '+')
         for key, qry in spec['transforms'].items():
+            qry = qry.copy()
             qry |= qry_base
             qry['from'] = qry['from'] or space
             qry['to'] = qry['to'] or space