Optionally, perform a full write of the module that contains the subject of the action
These actions are not stored in the glass panels, they are (for example) stored in a relay module. If glass panel A and B both operate a relay on the same module, it is possible to erase an action for A by configuring B.
Of course, this is not by design, but can happen if you started from a new project, did not read/have the existing settings in the module, or don’t have one of the glass panels for an action listed in your project.