Version mkgmap-r4286 was committed by gerd on Tue, 16 Apr 2019 mdr5.patch by Ticker Berkin: "If you have a map with cities but no streets, MDR5 sets the flag that indicates MDR20 indexes are present, and writes an erroneous byte after each record. Attached patch fixes and adds some more flag documentation." http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4286