Prefix formatting not preserved in Compile pane

I’m trying to format a title prefix in the Compile pane, by clicking inside the prefix in the bottom part and then choosing one of the formatting presets.
The preset is initially applied correctly, but if I ‘move away’, for instance by clicking one of the other levels in the upper part of the pane, the formatting is discarded.
What am I doing wrong here?

Ah, found it. If I select both prefix and title (i.e. the whole line) and apply the preset, formatting is preserved. If I select the prefix only, it isn’t.

That’s strange - the prefix should be capable of having a separate style to the title. What is your prefix? Could you give me steps to reproduce this, please?

Keith, I can’t reproduce the error. If the behavior occurs again I’ll post the steps.