partialFilterExpression error - Index with pattern {...} already exists with different options

Developer can't create two same indexes with different partialExpressions, for example:
Developer needs to create indexes with same patterns for types: 'a' and 'b', but not for 'c' and 'd'.
But he's limited (can't use) $in and $or in partialFilterExpression. He also can't create two different indexes with partialFilterExpression:

and partialFilterExpression: