Hi Peak,:_ don't use stairs and slabs (8/16) from the circular saw!
Thanks for taking an interest. I've obviously not explained myself properly.
Please note that this is with Minetest 5.0.0, not with 0.4.16.
This first image is from a brand new world with no mods enabled at all, except those that are in the default version of minetest_game.
I took this screenshot, then exited to menu, enabled moreblocks, then re-entered the game and took another screenshot. No other actions were taken by me, as you can see, I hardly even moved the mouse.