Using the new Admin-Theme-Uikit,
when assigning ->themeColor like ''warning" or "highlight" to fields or fieldsets, in LightMode it behaves as expected, (known from the past). In DarkMode it glitches. I have a few screenshots that best can show what I mean:
LightMode, (renders as expected):

DarkMode, (renders with unreadable text-colors and not nice background colors):


`
$fieldset->themeColor = 'primary';
$fieldset->themeColor = 'secondary';
$fieldset->themeColor = 'warning'; <--
$fieldset->themeColor = 'highlight'; <--
`
Discovered with PW 3.0.252