PynamoDB: v5.2.0 breaking change? AttributeError: type object 'Meta' has no attribute 'read_capacity_units'

The release of 5.2.0 broke GlobalSecondaryIndex syntax that worked on 5.1.0. Requesting to add a note about it in release notes for 5.2.0

Broken syntax in 5.2.0, but working in 5.1.0

class UserRangeKey(GlobalSecondaryIndex):
    class Meta:
        index_name = "user-range-key-index"
        projection = AllProjection()

    user_range_key = UnicodeAttribute(hash_key=True)

Valid syntax in 5.2.0

class UserRangeKey(GlobalSecondaryIndex):
    class Meta:
        index_name = "user-range-key-index"
        projection = AllProjection()
        billing_mode = "PAY_PER_REQUEST"

    user_range_key = UnicodeAttribute(hash_key=True)

Lines it breaks in is in PR #996