Threshold Binary Sensor not working after update

I had a binary sensor set up working perfectly like so:

binary_sensor:
-platform: threshold
entity_id: sensor.aeotec_zw096_smart_switch_6_power_2
name: Washing Machine
upper: 1
lower: 1500

It was working perfectly on 0.75.x and stopped when i upgraded to 0.77.3. The sensor that measure power is working fine and I can see the value changing, but the binary sensor never flips to ON when the value falls in the configured range. I didn’t see this as something that would break with 0.77. What can I do to fix this?