Deep LVS failing

[stafverhaegen-chipflow]

I have a teststructure that fails deep LVS but goes through flat LVS. This both for the LVS deck provided by IHP as for my Chips4Makers generated LVS deck. We both use extend("*") to get the full design (see also IHP-GmbH/IHP-Open-PDK#254).
I now made an extra test case where I used the global net connection as described in #1813: testcase_deep2.tar.gz. This also fails.
Problem seems to be that the nmoses are extracted at the wrong level in the hierarchy.
I am using klayout v0.29.8