Version mkgmap-r4670 was committed by gerd on Fri, 23 Apr 2021 fix two more issues with method connectUnclosedWays() which might show up with incomplete multipolygons 1) the algo supports a close of single unclosed way but did this only when at least two open ways were found. 2) if a single way was closed the code returned false instead of true. It seems that this error was previously fixed in the duplicated code BoundaryRelation but not here. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4670