Created attachment 154690 [details]
Result

SUMMARY
Checking "Limit to layer bounds" after the colorize mask had already been created for the entire canvas doesn't reinitialize the area outside the bounds 

STEPS TO REPRODUCE
1. Create new layer
2. Draw something on this layer, but such that its allocated size remains strictly inferior to the size of the canvas
3. Switch to Colorize Mask Tool, create a colorize mask for this layer, add some strokes to the mask
4. In Tool Options, while "Limit to layer bounds" is unchecked, click on "Update" and wait for the operation to finish
5. Check "Limit to layer bounds"
6. Click on "Update" again and wait for the operation to finish

OBSERVED RESULT
As evident from the screenshot, the canvas is updated incorrectly outside of the area of the smallest rectangle containing both the layer's and the mask's strokes. Zooming, panning or turning off the visibility for the colorize mask doesn't update it either. 

EXPECTED RESULT
The outside area should be blank

SOFTWARE/OS VERSIONS
Linux: Ubuntu 22.04.1 LTS
Qt Version: 5.12.12