Editing a plan notification does not seem to take affect

Problem

You have been editing a plan notification, but the edits seemingly do not take affect.

 System and deployment notifications do not seem to be affected.

Solution

This problem is caused by a severe Bamboo bug that will be addressed in Bamboo 5.15.0, refer to the following issues for details:

The only available solution is updating to Bamboo 5.15.0 –  meanwhile you need to apply one of the workarounds mentioned in those issues, for example:

Workaround