FormatAsync removes whitespace outside the requested bounds

Version Used: 3.8.0

Steps to Reproduce:

Consider the following code:

class C
{
    public void M()
    {
        // There is a space after the ; here, and 8 spaces on the next line.
        var i = 1; 
        
    }
}

If I make a FormatAsync call, with the bounds [109..130), I get back a text change removing both the space on the end of the var line and the spaces on the line after, with a changed span of [127..138). This span is outside the bounds of what I asked for. In practice, what this means that if I have on-type formatting turned on in vscode and I have a trailing space, FormatAsync will remove the auto-indentation added in to put my cursor, when all that was asked to be formatted was the previous line.