Nintex Newbie

Custom CSS Includes is not working in Nintex Form 2019

We are using Nintex 2019 and want to include css file in Nintex form settings:

After publish, css file is not applying to Nintex form. However we found the css file was loaded ready:

If I change the css file here in browser debug window, for example, add a space, the css will apply to Nintex form immediately.

Need help for this strange issue.


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