Internal error on "without_area" in deep mode

[klayoutmatthias]

files.zip
The attached DRC script with the attached layout (run with: "klayout in.gds -b -r test.drc") produces this internal error:

ERROR: ../../../src/db/db/dbShape.h,1239,m_type == PolygonRef
ERROR: In test.drc: Internal error: ../../../src/db/db/dbShape.h:1239 m_type == PolygonRef was not true in Region::with_area
ERROR: Internal error: ../../../src/db/db/dbShape.h:1239 m_type == PolygonRef was not true in Region::with_area in MacroInterpreter::execute
  test.drc:9:in `execute_drc'
  :/built-in-macros/drc_interpreters.lym:18:in `instance_eval'
  :/built-in-macros/drc_interpreters.lym:18:in `execute_drc'
  :/built-in-macros/drc_interpreters.lym:92:in `execute'

Without "deep" it works.