For some reason the region folding in .cs files is not working properly. When the region markers are on the same indent as the code, they are ignored. When the start region marker is shift tabbed, it folds all the way to the start of the next region or end of code block and ignores the end region marker. When both the start and end region markers are shift tabbed, the folding starts at the end region.
I do not know if I am doing something wrong or if it’s a bug in Sublime.