ZK-3958 added switch and toggle molds for button.
ZK-136 added indeterminate state API for button,

Currently, toggle mold and switch mold only support checked, and are not affected by indeterminate.

test with:
<checkbox id="checkbox" label="Checkbox" indeterminate="true" checked="true" mold="switch"/>
<checkbox id="checkbox" label="Checkbox" indeterminate="true" checked="true" mold="toggle"/>

switch and toggle should include a visual indicator of the indeterminate status.