Oh gosh, I'm not sure why I didn't see your last message in June. This problem might be a bit over my head, and it sounds like you might already know more about it than I do. But I'll try.
Ok, I've opened both files, but I don't see any ellipses. I see the toilets. For some reason, a couple of them are waaaaayyy over to the left! But they are paths. And they don't look deformed.
Hhmm, but then, I'm not using the portable version. I'm using the 7z package for 0.92.3, not portable.
Ooohh, you're saying that the toilets being in the wrong place IS the problem, right? But not all the toilets are far away. One of them is in the right place. Or at least it looks like it's in the right place.
But they are definitely paths, and not ellipse shapes. So I'm not sure if it can be blamed on changes to ellipse code or geometry or whatever it was. But there's a good chance I don't understand something.
Well, maybe someone else can offer more helpful comments.
If you still want to make a bug report, you certainly can. Start here, to learn what needs to be included in a bug report. And then follow the link to the bug tracker.
https://inkscape.org/contribute/report-bugs/Oh, one last comment. That displacement of objects seems suspiciously like bugs which are related to the transform attribute. (which is certainly not uncommon in a somewhat complex file like this) I don't think I've ever seen it with file format conversions. But that doesn't mean it can't happen. And it does seem suspicious.
Are you seeing this in multiple files? The workaround for those bugs is to move those objects to a new layer, and perform whatever you were trying to do that wasn't working before. But if it's happening in multiple files, that might not be really feasible. Not to mention the fact I'm not sure how moving to another layer would work during a format conversion.
Another potential trigger for these bugs (beside any random transform that you might do in a file) is to change the page size or switch from portrait to landscape orientation or vice versa. So you could avoid that, if it's relevant.
Ok, now this is really the last comment. I'm not sure what you mean by this
The elipses which were in autocad block, and the block had set -1 X scale, after exploded have different start and end point (reversed) even if they placed in the same location.
And the only -1 X scale problem seems to be with elipses. I checked other blocks setting them -1 X scale and exploding, and they look the same in Inkscape.
Whatever the autocad block is, or "exploding", I have no idea what it is or what it means. I've never used AutoCAD. But again, you're welcome to make a bug report.
But you do have the Scale set wrong for the SVGZ file. When I open the DXF in Inkscape, the scale is set properly. And the toilets are still far away. So I don't think the displacement of the toilet paths is related to the wrong scale. But I (or someone) can tell you how to fix the scale for the SVGZ file, if you like.