getBiomeCenters returns wrong biome sizes

[Gaider10]

Example in cubiomes viewer:
MC 1.20
seed: 7335000078560539927
Large biomes
Y: 64
x1: 2313 z1: 1533 x2: 2924 z2: 2133

Biome Statistics scale 1:4 Mushroom Fields count: 4730

Biome Locate Mushroom Fields area @ 1:4: 1 + 9206

This happens because in floodFillGen the same position can be added to the queue multiple times before one of them gets popped and the position's ids entry gets set to INT_MAX.
Checking for ids[k] == INT_MAX before processing each popped queue entry fixes the issue.

[Cubitect]

Thanks for the report. Fixed in the 4.1 release.