Nifi misses parameter context inheritance after restart

Hello Team, 

We are on Apache nifi 1.16.0 and openjdk 11.0.20, using parameter contexts to store sensitive parameters for the components of the flow. We have 3 issues when using parameter contexts 

1. Issue when updating parameter contexts, it fails to update parameter context and gives below error after I click on Apply. However, when I click on OK and refer back to parameters they are updated sometimes or depends on the stage it fails parameters not updated. I thought its worth mentioning that updating parameter contexts fails at different stages i.e  disabling controller services/Re-enabling effected controller services...










2. Inheritance for parameter contexts misses after Nifi restart. Some process groups couldn't read parameters after restart. When checked inheritance for the parameter context, observed few parameters contexts are not inherited. So, we had to manually map the available parameter contexts to be inherited every time after restart. 

3. Sometimes reference to the parameter context in the process group is lost and we need to add it again.

I am not sure, if issue 1 &2 are related, any ideas for troublehooting will be helpfull. Didn't find any problem tickets filed for this.