openlane/magic question: in case of DRC failures, the tcl script writes a .mag file with the drc errors. To open it using magic, I use this command line:

magic -T $PDK_ROOT/sky130A/libs.tech/magic/sky130A.tech xxx/yy/prj.drc.mg

. But I get many error messages

Duplicate cell in prj.drc: Instance of cell INST is from path xx/yy but cell was previously read from sky130A/libs.ref/sky130_fd_sc_hd/maglef

. I don't understand how magic knows about `sky130