Table cell background color does not get saved when selecting multiple cells

Steps to replicate

1. Create a new Confluence page
2. Insert a table with at least two cells
3. Select two or more cells by dragging with the mouse
4. Set a background color
5. Click on Preview or Save
6. The cells will still appear white

This issue does not occur when you tint the cells one by one. It also affects just the last modification before saving. For instance, if you tint two cells in row A and two cells in row B afterwards, only the colors for row B won't be saved.