(Fixed - Locked thread) Mixer Brush not working properly (build: 23.4.1)

Problem: Mixer brush on first stroke does not sample the layers and is applying what appears to be a dark grey mix. Must undo the first stroke, and then subsequent strokes properly sample the layer.

Settings:

Load the brush after each stroke: Off

Clean the brush after each stroke: On

Custom

Wet: 27   Load: 27   Mix: 47   Flow: 49

Enable Airbrush: off

set smoothing: 10%

Brush angle: 0

Sample all layers: Off

Always use pressure: off

Device: Mouse