To clarify the bug with macOS 10.15.7 screenshots.
Attached files show the selected text value (1575 px) within the Transform Panel > Panel TextField [X pos] render correctly in Light Mode and incorrectly in Dark Mode.
*Note: The issue persists for ALL of the UI Panel TextFields in Dark Mode.
Stephan Mönninghoff commented
Same problem here. Text is white on white background when dark mode is turned on in macOS.