Windows 10, xbox one, and PE bedrock 1.2.9
In my realm there is an area where i have built on previously and it wasnt untill the recent update 1.2.9 that i could no longer place blocks in a particular area. i can break then but cannot place them so i know it not because of adventure mode. I also have the same issue in creative mode. its a 20 by 40 area that is 4 thick. and when i place a block itll be placed then dissapears and returns to my inventory. Ive tested this after i have Downloaded the world and no issue but when loaded onto a realm the issue is present. when on the realm i can do /setblock and /fill and it stays but dosent when manually placed

here is a video ive uploaded https://youtu.be/D62f0jr3V0E