Changing the Name of a Theme

Hello!

I was change the helium theme name to mytemplate.
only one problem is the output css name can't changed.

<link href="/user/data/gantry5/themes/mytheme/css-compiled/helium.css?58bab8 e1" type="text/css" rel="stylesheet" />
<link href="/user/data/gantry5/themes/mytheme/css-compiled/helium-grav.css?5 8bab8e1" type="text/css" rel="stylesheet" />

I looked gantry docs and the rename correct, I think.

I rename the joomla theme and that was run correct.

My question what can I rename yet?

This is a gantry-specific question, so it's best to ask that question here: https://github.com/gantry/gantry5/issues