Background fill color bucket always reverts to yellow

In LO Writer, I need to mark certain table elements in specific colors.

For that I use the background fill bucket in the table tools bar on the bottom.

I select the color, for example grey, the table background gets filed with grey. I continue my work and after moving the cursor out of the table it resets to a garish yellow instead of remembering the last selected color.

How do I either change the default yellow in the bucket fill tool to the grey I need or how to I set it to remember the last color used?

This has nothing to do with styles. Even when setting styles it will revert back to yellow.