When i do a cut-sweep on one side and mirrored that cut-sweep, the original cut-sweep disappeared, why ?
I tried it in SolidWorks, but not like you,
Now you reset the system options: Tools - Options - Reset.
and if still missing as well, email me your file., so I help more in, and my advice if you are using a "cut swept" like in the picture, it is better to use champer, and setting distance distance.
you can provide an image of your point ...?
I don't know why but for any reason I just change in the feature tree mirror step and now it's working. Damn it ! :P
I'm going to give you a big thanks for your support cause no one shoot me a message except you . cheer !
I was relieved, your problem is solved. :)