When HighContrast checkbox 
enabled the textbox hint color automatically change to Yellow and can’t be change again until the HighContract checkbox unchecked.
When HighContrast enabled checkbox hint color turned to Yellow color -
If it is only in companion, you should check in APK because sometimes it does not generate this error and if the error is in APK it is a bug that must be solved!
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Yes, Same thing happened in Live test also after build
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