oj-select single value item is not resetting to nulll

Summary

oj-select single value item is not resetting to nulll

Content

Hi , I have value item for oj-select-single. If I select 'ABC' and clearing out manually to blank....$variables.selectedEquipment.data.key is still referring to 'ABC' instead of null

It is the same behavior with Inputtext....once I enter value 'XYZ', value is not resetting back to null if I clear the input text.....

I have button disable logic based on above which is not working as expeced...Any inputs pls..?