All advancements mode automatic detection does not work properly when worlds are pre-generated

[char3210]

When playing MCSR Ranked with the pre-generate all worlds option enabled, the calculator detects that the end spawn region has been created and the all advancements panel is opened before the player has entered the end.
One option is to instead detect existence of more than 4 files in the folder, which will happen once the player enters the outer end, entering a different region from the 4 at spawn