Why i cannot save a smart object?

[nikoskostan]

I double click a smart object, a new tab opens with the smart object in it, I make the changes i like, then i click save, and instead of saving the changes and get me to the first tab, the jpeg save dialog apears.

What's going on?

[nikoskostan]

Well nevermind i found the solution to it...i have to reconvert the smart object to smart object "again".

Pretty sure this is a bug.

[c.pfaffenbichler]

»Pretty sure this is a bug.«

Pretty sure you are mistaken. 

What is the SO’s file format and what were the changes? 

When one places a jpg as a SO for example the SO is a jpg – unsurprisingly. 

When one edits the SO and adds features that the jpg-format cannot sustain (like Layers for example) one cannot save the SO naturally, but has to save in a file-format that support those features.

Which results in a new file which one can then use to replace the original SO. 

[Trevor.Dennis]

How were you saving the edited SO?  I've never used anything by Ctrl S to apply the edits, but if I want to save the SO as a new file then going via the File menu does that.  That's normal behaviour.

[c.pfaffenbichler]

Maybe check out this Feature Request: 

https://feedback.photoshop.com/photoshop_family/topics/smartobject-auto-convert-jpgs-to-psd

[Bojan Živković]

I think that c_pfaffenbichler has good guess what is the problem. One of the solutions is to flatten from Layer > Flatten Image before saving. Is that solution to your problem?