Maybe I solved the mystery. My ordered list was part of an unordered list. This work correctly:

• item zero

  • item one

    1. alfa
    2. beta
    3. gamma
    4. delta

but this does not:

• item zero

  • item one
  1. alfa
  2. beta
  3. gamma
  4. delta

Maybe I solved the mystery. My ordered list was part of an unordered list. This work correctly:

• item zero

  • item one

    1. alpha
    2. beta
    3. gamma
    4. delta

but this does not:

• item zero

  • item one
  1. alpha
  2. beta
  3. gamma
  4. delta