incorrect scan range determined for 2 AND'd comparisons on the same field

Query:

SELECT profile_details.loyalty.loyalty_score FROM default WHERE profile_details.loyalty.loyalty_score > 8 AND profile_details.loyalty.loyalty_score < 8.5

Plan scan range:

"ranges": [

{ "inclusion": "high", "limit": 0, "low": [ 8 ] }

],

Range should have upper-bound of 8.5 as well.