As an example:
1. I create a scene with a few objects,
2. computes lightmap,
3. add a few snapshots,
4. computes lightmap -> Geometry distorts or disappears.
After first lightmap.
After snapshots have been applied and compute lightmap again.
The distort also occur when I happen to double click on snapshot. And some objects can disappear when I compute lightmap the first time.
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