extruding deleting parts of sketch

any ideas why when extruding certain parts of my sketch, it deletes other parts of my sketch? I’ve even had it delete things on other sketches on the same file even when they are not selected or close together. I’ve been using this program for over a year and have never had this problem.

You are using the History/Parametric Beta version? I’m interested in this answer myself as it happened to me. I think someone posted the answer here somewhere recently. I’ve forgotten the answer and I can’t find it.

Are you sure that the sketches get deleted after doing an extrusion?
It is my understanding that sketches get auto-hidden after the extrusion.
It happens on the non-parametric version as well. I’d like to understand why the auto-hide?

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Same as Mike, auto hide in the non parametric version. I thought it was just a bug until I seen this topic.