The grid (core) · console.warn

no band "{id}" to move.

Printed by The grid (core), prefixed [lattice], since 1.29.0.

Warnings reference › columns.group.move:*

Identifier: columns.group.move:*
Raised by: The grid (core)
Since: 1.29.0

What happened

moveGroup() named a band that does not exist, so nothing moved. A band moves only among its own siblings, so the call would not have left its level in any case.

The fix

Check the band id against the resolved column groups.

Reference

Covered in full at the API reference.