The bug
The q.model_scale molang query returns different values in a particle context compared to a geometry context. By default, an unscaled mob (scale 1.0) properly has q.model_scale return 1.0 in a particle context, but 0.0625 in a geometry context.
How to reproduce
Download and open the attached world
Hold the two different items in your hand and look at the display on your screen and above the frog
Expected results
The “q.model_scale” line should always display 1.0
Observed results
The line displays 0.0625 in the geometry display