Created attachment 100679 [details]
[screenshot of the bug, annoted]

Hi,
It's a little bug I catch today: newer version of Krita were not restoring a specific "color-label" of layer set in Krita 3.0 ( the dark grey color, if I unzip the *.kra ; maindox.xml keep the layer color with this : colorlabel="9" ). A picture in attachment show the problem.

How to reproduce:
===============
- Open a document with layers in Krita 3.0
- Right click on a layer node in the stack, and in the contextual menu select the last color proposed (dark grey)
- Save document.
- Reopen the document in 3.0.1alpha1 or 3.0.1alpha2 appimage.

Result:
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The color label isn't restored. ( WIP *.kra comic page demo file: https://share.kde.org/index.php/s/Gz5uEjGEmHf46Vw ). After investigation with DmitryK on IRC ; he told me a color label was removed after a suggestion of Gdquest. 

Expected:
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I understand newer version of Krita can't read colorlabel="9" :  the color slot "9" is not existing anymore in newer version.  The ex-light grey color ( color 8 ) got removed and ex-dark grey color ( color 9 ) now take the slot color 8. 
* proposal :
Maybe Krita can workaround this with a type of pseudo code :
``` if colorlabel=9 then colorlabel=8" ``` ### Probably a bit dirty :/  
or 
``` if colorlabel>8 then colorlabel=8``` ### maybe wiser to always fallback on 8 for any superior value...