A few days ago I faced some problems with Jira Workflow Toolbox. Some parser expressions can't be loaded and I have no idea why it is going that way. I changed fields, checked expressions, tried to copy this rule and import it again, but none of this working. It is started after updating JWT on version 3.1.6. Has sombody faced a problem like this?
Thank you for your request! Good to hear that you were able to avoid such a problem but, this is a known issue introduced with JWT 3.1.6. We will take care of it in the next version planned for September.
If the keeps recreating itself, I would suggest you downgrade to another version in the meantime.
We found solution of this problem. To fix it, you need to clear cache of add-on on your unit. Here is the guide how to fix it: