saltstack pillar odd

# global.sls
foo:
  item1: True
# server.sls
foo:
  item1: False
  item2: False

# This works as expected
base:
  '*':
    - global
  'role:server':
    - match: grain
    - server
# grains:
role: server

# Result:
foo:
  item1: False
  item2: False

# =======================================================================
# This does not work. The server pillar data is set but the global pillar
# data overrides it when using roles instead of role. Odd
# =======================================================================
base:
  '*':
    - global
  'roles:server':
    - match: grain
    - server
# grains:
roles:
- server
# Result:
foo:
  item1: True
  item2: False