It looks somebody else met this issue last month.
I think you can try something like this,
Find GetTables function in Extractor.cs, see whether the SqliteColumnType contains Numeric item like this screen shot shows:
If it don't contains that, please download latest development version 9.0.x.0 dlls.
My test version for MapSuiteCore is 9.0.379.0.
Wish that's helpful.