Material-components-web: Adding disabled to css only select makes it disappear

[deap82]

What MDC-Web Version are you using?

Recreated in code pen, so current version at
https://unpkg.com/material-components-web@latest/dist/material-components-web.css

What browser(s) is this bug affecting?

Tested in Chrome and Edge

What OS are you using?

Windows 10

What are the steps to reproduce the bug?

Add disabled attribute to a select.mdc-select element.
See code pen: https://codepen.io/deap82/pen/egXBQa

What is the expected behavior?

A disabled select element.

What is the actual behavior?

The select element goes completely invisible.

[Garbee]

Looks to me like the dark theme modifiers being generated are causing this. Once I uncheck them in the Elements panel, things look right.

[traviskaufman]

Definitely a bug. Thanks for filing!