Internal error on net extraction

[klayoutmatthias]

The attached test case gives an internal error with this script:

source("xx.oas.gz")

deep
verbose

m3 = input(19, 0)
v2 = input(18, 0)

connect(v2, m3)

l2n_data

Error message is:

ERROR: ../../../src/db/db/dbHierNetworkProcessor.cc,1946,id_new != 0
ERROR: In /home/matthias/klayout/testdata/x.drc: Internal error: ../../../src/db/db/dbHierNetworkProcessor.cc:1946 id_new != 0 was not true in LayoutToNetlist::extract_netlist
ERROR: Internal error: ../../../src/db/db/dbHierNetworkProcessor.cc:1946 id_new != 0 was not true in LayoutToNetlist::extract_netlist in MacroInterpreter::execute
  /home/matthias/klayout/testdata/x.drc:13: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'

xx.zip