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This isn't the first time that this has happened to me. This also happened to a different project I had 2 months ago in version 2.8.

Objects would just disappear the next time I open the project. Yes I checked if they were in a hidden collection, I kept toggling / , and I tried Alt + H . The first picture was a test render I made, and the second is what it is now from the same view.

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There is no way that I accidentally deleted them, since staircase is made of 3 separate objects and I would have to select all of them at once then delete them. Besides that, other objects in different locations also disappeared at the same time.

The one thing I noticed is that the objects disappear after open and start working on a different project. There is no particular order that they disappear either. Below is a couch that I modeled. The main cushion was the first one that I made, followed by the 4 large pillows, then five smaller ones (The three in the middle and two on each side that were leaning on the arm rests). Even though I made the cushion first and the small pillows last, they both disappeared, along with a table I modeled many weeks before the couch itself.

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I need help to somehow find out how to recover the objects and/or prevent this from happening again.

edit: screenshots of my outliner

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    $\begingroup$ Please show a screenshot of your outliner $\endgroup$ – Gorgious Dec 21 '20 at 10:01
  • $\begingroup$ Check Orphan Data in your outliner, although I'm not sure how it would get there... $\endgroup$ – Psyonic Dec 21 '20 at 10:23
  • $\begingroup$ Is there any chance you have assigned another mesh to an object, orphaning the original, wihich will be lost on reopening. Eg shift D default cube. Assign mesh "Cube" to duplicate. "Cube.001" mesh will be orphaned. $\endgroup$ – batFINGER Dec 22 '20 at 11:52
  • $\begingroup$ I did use shift d to duplicate (the pillows for example, and the top boards on the stairs but in edit mode). But I don't know how to assign a mesh to another object so I don't think so. $\endgroup$ – J Lyn Dec 23 '20 at 1:07
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Try to press the 1 button on your keyboard (not on numpad) in object mode. You are maybe viewing different layer. This happened to me a few times.

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  • $\begingroup$ Forgot to add it, but yeah I already made sure all layers and collections are active. This is the second time that happened to me on 2 different projects. $\endgroup$ – J Lyn Dec 22 '20 at 2:25

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