Can you reproduce this with one of the default skins?

@fplanque
yes, I can reproduce this using skin bootstrap_blog v6.11.4
I can reproduce the bug on demo version Blog A at demo2.b2evolution.net.
The error message is the same.

("In-skin change proposal:" is activated in any mentioned case)

OK, you cannot actually call ?disp=proposechange without passing a &p= param.

The correct links to propose a change can be displayed by the Item Small Print widget.

@fplanque
so; there is no way, to generate a list of posts containing proposed changes?

To illustrate that question:
If I want to get an overview of images (almost of those added to a post] I can use ?disp=mediaidx (This is a way to keep an eye on)

Although the post for which a proposed change was created should normally be edited promptly, it happens from time to time that I just forget about it.
Now there is no way to get an overview of the pending proposed changes (except by database queries). But that would be fine.

So I suggest a new feature that shows a list of posts with unprocessed proposed changes under ?disp=proposechange (without &p=ID).

so; there is no way, to generate a list of posts containing proposed changes?

Indeed there is no way at this point. But you receive email notifications for each proposed change.

I suppose finding the value in the database and then listing the posts would be the way to go ~ when and if I have the inclination :)