Eraser Size won't change in Photoshop CC 2018

Hi there!

Before, I've always been able to change the eraser size on the fly when I would switch from the brush tool to the eraser tool by using the special "Erase" setting that you can program in Wacom pens ( by default the back of the pen, or assigning this "erase" function to any other button).

So, it would go like this:

1. I'm painting with the brush tool.

2. I press down a button with the Erase function programmed. The tooltip temporarily changes to the Erase tool.

3. I press [ or ] to change brush tip size.

4. Erase away.

5. Release button, keep on painting.

This worked fine up to Photoshop CC 2017. This new version simply doesn't change the size. As I press [ or ] it changes the brush tool size, leaving the erase tool unchanged.

I wonder if this is happening to anybody else.

Also, I'm in Windows 10.

Thanks for looking into this!