Object Flip on center when cut

Bambulab Studio 1.8.4.51
I create a cube and set the height to 2mm then I add text and set it to 1mm embedded. When I want to cut the text above 2mm.
I uncheck keep part A (upper part) and keep orientation.
When I click Perform Cut the whole object Flip over and ends halfway outside the plate.
I never had this problem before in the older version.
I had to keep both parts and then after delete the part I didn’t want.
Anyone have the same problem

I reported the bug before. It was also in the previous version.

Thanks, i thought I was going crazy.