well strangely i can build a rice farm on a different part of the large map. this is the second game under version 40 i have noticed this and also for whatever reason under windows 10 build 1903 or 1909 instead of 1809. caveman3cosmos doesnt always seem to work right with the newer versions of windows 10. overall i waited till 1909 version and it seems to work better. yet when i downgraded to 1809 from 1903 caveman2cosmos worked much better with 1809 version. so not sure what to say or why this happens. just letting you all know overall the bugs are much less than before; yet i tried the original unreleased version and still got this one small error that comes up once on a large map with abundance of resources and rivers.
so i am not sure what to say.