I’m unable to reliably reproduce this issue, but occasionally when selecting a large number of parts, a lag spike causes the selected objects to completely disappear. They are also removed from the undo history, leaving no way to recover them. This has occurred several times and is extremely frustrating.
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Occasionally, when pressing Ctrl+X to cut a part/model from explorer, the content is deleted and does not appear in the undo history. It is still copied to the clipboard, which becomes the only way to recover it.
Another thing to note when it happens it has a bit of lag.
In response to your questions:
The steps to reproduce is simply pressing this seems to be luck of the draw.
