Unexpected node group draining behaviour

[josefbarak]

Node group draining behaved differently than described in README.

drain_node_groups = {
nodeGroup1 = true,
nodeGroup2 = false,
}
This actually drains both node groups.

drain_node_groups = {
nodeGroup1 = true,
# nodeGroup2 = false,
}
This drains nodeGroup1 only.

drain_node_groups = {
# nodeGroup1 = true,
nodeGroup2 = false,
}
This drains nodeGroup2 only.

From what I have tested it seems just the presence of node group in drain_node_groups is enough to drain it.
eksctl version 0.74.0
mumoshu/eksctl versions 0.16.2