pattrstorage "Storage Slots" changes not saved

When I open the "Storage Slots" window of pattrstorage object with the storagewindow message and change some of the values in the stored presets, the changes are not written to the json file, not even upon force saving the patcher.

In order to change the stored presets I need to write the changes directly into the json file itself.

I have also noticed that changes in the "Storage Slots" window do not dirty the patcher, which could indicate the problem.

Is this a bug?

See the screenshot to see where I am trying to change the values.