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I was trying to change rotation of a just inserted block by clicking in "Misc" of the properties box.
Suddenly I just had the block in view and the command line said
_Entities in set: 2
Number of entities made hidden: 1229
Following is the history before that time. I have no idea what triggered the sudden departure from my screen of 1229 entities.
Any ideas please? I'm curious and it was very alarming for a moment as having never encountered such I thought all my work was suddenly Goodbye!