I am making some workflows and ended up with the following problem.

Every time I want to make a workflow based on certain trigger - it breaks.

Trigger is Date / Time - Change Log Time

Set up is On Change Log Time

Condition is 

Last Activity is Age > 30 days

Action is

Add tag Decaying

The result - saves successfully, but when I try to open it is always a broken screen.

Tried another browser, incognito mode, etc. nothing helps