This happened with my DD.
The LA dillydallied about family finding nationally, to try and save money, and this delayed her coming home by nearly a year.
However, while she is a 'healthy white baby', she also has a factor which the wider family and friends of her BF wouldn't know, that made her 'hard to place'.
But my experience is that, yes, a 'healthy white baby' can be hard to place, unless you know everything about that baby's history, you probably won't know why, and, yes, and LA will leave a child in foster care longer when they don't need to, in an attempt to save both money, and effort. The child is safe in foster care, and placing out of area is hard work for all.