Pattr and Pattrstorage in m4l behaviour

I try to describe the problem I have as well as possible:
I have a [pattr] and a [pattrstorage] in an m4l patcher. When I load data (blob/path via dragndrop) into the pattr, the pattr stores all values in ableton/m4l.
Now I can save/write the data to a json file via "write" with [pattrstorage] . So far, so good.

Now when I read a json file from my hard disk (read via pattrstorage), it loads all the data I need now into pattr.
BUT the data is not stored in the pattr(ableton/m4l)! It shows everything correctly in the Pattr Window, but when I save and reload the Ableton set, it shows my old value, not the previous loaded value.

It seems that pattr ignores the pattrstorage loaded values when saving.

I have experimented a lot with it and it seems to be the only solution to connect the [pattr] output via a [trigger s] to the input of the [pattr] object.
Now the pattr restores the correct value when reloading the Ableton set.

In short: the values loaded via pattrstorage (read) are not stored within pattr/ableton, even when they show up in the pattr window.

Why pattr does not save loaded pattrstore values?
Is that a fault, am I missing something?