Strange extrusion behaviour - faces disappear

I’m pretty sure this didn’t happen when I last tried it (a few years ago I must admit). Three faces, extrude the outer ones upwards, and the original faces (that were extruded) have vanished. Not a biggie, but seems strange.

That is the correct behavior - I even went back to 2.56 (before Ngons) and checked

OK, thanks for that. I’ll just have to take it into account if if becomes important.

Sure thing, I believe it’s set up this way so it doesn’t create ‘interior faces’. Imagine you had to extrude 100 faces, it would be un-productive to go back and delete all those interior ones :wink: