As I said previously, nothing unusually and no Client instability. Earlier, I completely reset (deleted the file) the nether, but just now about 20 minutes ago the nether has reset again.
The Earlier one is before it happened, the latter after it happened.
There was no client instability/crashes, just the nether dimension reset to a much earlier state from about a week before, but the overworld did not.
As I said previously, nothing unusually and no Client instability. Earlier, I completely reset (deleted the file) the nether, but just now about 20 minutes ago the nether has reset again.