The latest beta can't do focus stacking, it just overloads the processor (also an I7) and basically makes the PC useless for anything else while it is running, or attempting to align the images for a focus stack, the only escape after a long wait for anything else to happen is to power the PC off. A pity as the earlier 1.6 series betas did some awesome focus stacking.
Then there is the layer problem., try adding a layer then moving whatever image is in that layer, it just stays in the same spot dragging the whole image along with it.
The only reason I've stayed with affinity is that the selection tools work well and just do their job, but with the artifacts that seem to have just appeared on all images after focus stacking, (with the production version) it becomes quite a chore to select anything as you have to spend quite a while cleaning up what should have been clean edges from the focus stack. This is the first time ever for me that beta programs have regressed from a great start. A pity actually.