Blocks appear invisible after edges of the main End Island; Blocks placed beyond the edge appears at Y=0 of the edge

I was trying to start and build an Ender Pearl farm, and since it is ideal to buld 100 blocks from the edge of the island, I attempted to do so. However, blocks become invisible starting from edges of the Main Island on X and Z axis on both + and - coordinates (refer to Screen Recording). I placed blocks and they did not appear. I did the ol' Save and Exit to reload the world.

The invisible blocks were no longer "steppable", however, they have been teleported to the Y=0 of the edge of the Main Island (Screenshot)

Attachments:
Screenshot: the small rectangular figure are the "teleported" blocks
Screen Recording (8 sec): invisible blocks
Screen Recording (10 sec): error on creative mode