Trot costing stamina

When using my sarco in Riparia, I noticed that whilst using trot speed, my stamina was being slowly drained

I have recorded a video that show me using normal analogue to trot (without sprint activated), using L2 button to walk and also activating sprint to run full speed. Trot was draining small amount of stamina and also lighting up the icon that usually is only lit up when sprinting

Usually trot speed costs no stamina, and does not light up the little white icon (usually only visible whilst sprinting)