Randomly dies in Nether on Survival mode when towering up

I randomly died thrice in the Nether (Single player - Survival Mode) when I am towering up to go on higher altitudes. The random death occurs just right after I jump to place a cobblestone then the Death Screen appears. First death when I went to loot a bastion, towered using cobblestone then I died just right after I jumped to place a cobble, and says I fell in the world. Then the second and third one I did it in the same area with same goal to block the lava source, the second one occurred when I was going down breaking the cobblestone I just towered not long ago, I died. For the third time, in the same area I also died randomly I checked the chat section and it says I died due to fall damage [something like 'fell in the world' or 'fell']

**I played the both scenarios in Peaceful Mode so hostile mobs wasn't the cause. The world I was playing do not have any behavior packs as well.

The image shows where I died all of the sudden and the items I got before I died, changed to creative mode to screenshot what happened.