Debug info: beta1.15.0.51 (cli-p392, s1770030287) SAMSUNG SM-J727P, Adreno (TM) 506, Android 8.1.0 FPS:48.1, Server Time:8.8, Mem: 278, Highest Mem:278, Free Mem:344, GUI Scal: 3.0
When a player creates a map, whether it is obtained via crafting, Creative Mode, or commands, the map is immediately made in 4/4 scale without the player expanding the map manually. Has been observed occurring when running the command "/give @s emptymap" and creating the map, and crafting a map via Cartography table.
I discovered that this report is a duplicate of MCPE-63416, please tag this issue as resolved, my apologies.