The new features, including reefs will generate only in new areas, and the new world gen tweaks may include chunk smoothing, as in it may look very odd as the game tries to knit the chunks together.
I am hesitant to add to this as I am not competent regarding none x86 architecture CPU's, but cursory research suggests the issue is with compatibility with the CPU as well, a ARM chip lacks a lot that the x86 chips have as standard, and typically is bypassed by translating the relevant calls, this leads to issues where niche calls can be overlooked or simply not included.
In short I think your CPU may not have the compatibility required to run the game. The game is designed on a more open to the public system of libraries as in OpenGL and OpenAL, probably a library like SDL2 or SFML... open libraries that are not mainstream, so may get skipped by compatibility coders for more mainstream application.
I would either refund, or look for none official patches for compatibility, check your compatibility softwares community pages to see if there is some open sourced patches, or put up a reddit thread in a relevant compatibility software section for unofficial patches for your compatibility software.
Sorry I couldn't help much.
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