Hi sns,
Great to know that and thanks for sharing the update here.
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.". and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[While publishing the workflow below error]
Issue Symptom:
While publishing the workflow below error , Please suggest what could be the issue and what we need to verify, It is SharePoint 2016.
Current status:
After Nintex version upgrade issue got fixed
You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community members to see the useful information when reading this thread. Thanks for your understanding!