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I experienced it too. In my case, the duplicated object comes using the merge feature tool during editing: after saving, one feature appears, while another has been duplicated (only the shape, the attributes remaining those of the feature the has gone). The problem seems not to occur if the merge action is performed after a save and is followed by another save editing.

Btw, I'm experienced some misbehaviour during editing with master on win machine, that can be summarized:
- loss of features (related with merge tool?);
- all feature disappear if using modifing tools (node, split feature, move/rotate); no snap is possible over the disappeared feature until save edits is done.
There are other tickets concerning these arguments:
- Bug #7472 (New): vector editing errors;
- Bug #7267: loss of attributes during cut feature operation;
- Bug #7668 (New): Merge feature tools causes Qgis crash;
Jürgen Fischer posted a link about: http://lists.osgeo.org/pipermail/qgis-developer/2013-April/025320.html ff

I can fill in a bit more context from seeeing it first hand. I was originally thinking this was to do with the post all layers feature, but it happens when saving an individual layer so is not connected with the new post all feature.

What I saw on a map I was working on right now is as soon as I clicked Save, the feature that I had previously delete off the map was reinstated to the map.

I am aware there is an undo function and I assume the deleted feature is kept in the undo buffer, from where it seems to be being reinstated at a save.

And it gets worse. There wasn't one previously deleted feature reinstated, there were multiples.

But having re-deleted these features, they were not reinstated again on the next save. It seems quite random.

And more ... it deletes stuff I just pasted into it.

There hasn't been any comment on this bug for a while, what is the timeframe for resolving it?

Patrick Dunford wrote:

what is the timeframe for resolving it?

it must be fixed anyway before 2.0

Patric, others, has anyone witnessed this issue in the last few weeks? I did see this issue over a month ago but at the time was unable to come up with proper steps to reproduce the issue 100% of the time.

Today, I tried editing a shapefile in a variety of ways to see if the duplicate issue is still there, but couldn't reproduce.

It is data that has been deleted which becomes undeleted at save and I see it all the time.

I have been adding and deleting features on a single layer with no duplicate data. If you lock down a process or some sample data that would be handy.

Patrick Dunford wrote:

It is data that has been deleted which becomes undeleted at save and I see it all the time.

Hi Patrick, I have seen this issue in the past, but I'm also not able to replicate it anymore, would you mind add a project with data and the specific steps to replicate the issue? Or even a screencast would help. cheers.

It is just completely random and happens in every shapefile layer I can think of. I doubt there is any way any sane person could create a sample.

Patrick Dunford wrote:

It is just completely random and happens in every shapefile layer I can think of. I doubt there is any way any sane person could create a sample.

it was probably fixed with #7472