While all menus are correctly coloured every world I have tested is simply rendered in green without the red or blue. This includes Minecraft's own intro screen highlighting this is no corrupted world issue but a render bug.
Unless this is some late April 1 prank or this game just declared love of the Irish, Saint Patrick and Leprechauns then this looks like bug in your latest beta release.
This issue is being tracked at MCPE-220308.