Lr9.2.1 Drag and Drop to the Map Module works for me. Strangely, the first time I went to the Map Module Lr crashed but has been working since. This is the first Lr crash I have had for a LONG time. MacOS 10.14.6
Yes, the map module has been broken for quite some time. I do not remember how long it has been since I was able to drag and drop images onto it. Even when the images have GPS data, they no longer appear on the map.