Due to a typo caused by copy-paste, materials' dataStart and dataEnd were set to same value because they were read from the same vector entry.

That resulted in building materials with exactly 1 element; which also involved the build into memory of only 1 element per material as well.

Until you build the GeoModel tree, the caches are not created yet; however, the low-level methods can access the DB directly. So, the existance of a table should be verified at the DB level, not at cache level; otherwise the test fails when calling methods before building the GeoModel tree.