While farming in a Survival Minecraft world, I had accidentally switched my stone axe to my offhand by clicking F. I didn't want the axe there, so I pressed F to switch my axe back to my offhand. In doing so, however, I noticed that it took longer for the axe to reappear on the screen than it took for it to reappear during the accidental switch of the axe to the offhand. I was then intrigued, so I tried the same process with a block of dirt. I was surprised to find that the block of dirt, rather than the axe, took the same amount of time to switch to the offhand as it took to switch back to the main hand. I tried with my other stone tools, and found that they all behaved similarly to the axe.