Oh, I found this error, so maybe it is a verilog problem after all: (this should be enough for me to debug.. so never mind for now!) /home/runner/work/tiny_user_project/tiny_user_project/openlane/tiny_user_project/../../verilog/rtl/top.v19 ERROR: Identifier `\xnor_y' is implicitly declared and `default_nettype is set to none.