Created Unassigned: Shifted conditional formating colors after the sheet is overwritten or new sheet is added. [9406]

Hi,

great library, thank you!

I found a bug in conditional formating. I am filling cells in range with conditional formating setting the background colors by the content. This is the only part of my code that uses conditional format:

rangeDays.AddConditionalFormat().WhenStartsWith("D")
.Fill.SetBackgroundColor(XLColor.Red);
rangeDays.AddConditionalFormat().WhenStartsWith("p")
.Fill.SetBackgroundColor(XLColor.Cerise);
rangeDays.AddConditionalFormat().WhenStartsWith("N")
.Fill.SetBackgroundColor(XLColor.Yellow);
rangeDays.AddConditionalFormat().WhenStartsWith("S")
.Fill.SetBackgroundColor(XLColor.FromHtml("#9999FF"));
rangeDays.AddConditionalFormat().WhenStartsWith("§")
.Fill.SetBackgroundColor(XLColor.GreenYellow);

When I save a newly created excel it works fine. But If my code modifies already existing excel either by deleting the same named sheet and created a new one or by adding a new sheet which is filled in the same way as the previous one was then the conditional formating colors are shifted in this way:
D - #9999FF
p - GreenYellow
N - Red
S - Cerise
§ - Yellow
The palette looks shifted by 2.

If I do it one more time and add third sheet it gets even weirder:
conditional formating is shifted again, now more randomly, some are shifted from the previous step, some are not:
D - Cerise
p - GreenYellow
N - Red
S - Yellow
§ - #9999FF

And the weirdest part, the cells whose color is not set at all are now red