Is the display of subbed variables in the JME part's correct answer field wrong?

First of all, I expected subbed variables to be shown in a different colour, like in the writemaths preview.

The variable name `u_dash_v` was rendered as

It should be shown in monospace text.

Reproduce the rendering in the JME part's correct answer field and compare it with the writemaths preview. The issue is done when substituted variables such as `u_dash_v` are displayed in a distinct colour and monospace text.

Written by the indexing model from the issue text.