Hi Amenel thanks for posting! Does this occur on every document or just one? It would useful to take a closer look would you mind filling out this form and including the document URL? Thanks!
I have just opened a new document in order to answer your answer and yes it does happen in that new document. Drawing a line from shape "Block" to "Mind map Cloud" has the cloud shape filled with orange.
I filled the form and included the link to the document and I provided steps to reproduce the problem as well as the expected behavior. So far this problem only occurred when Mind map Cloud shapes are the target of a line but I can't certify that it does't happen with other shapes.
For now the workaround I use is to draw the line from my Mind map Cloud shapes to other shapes.