Yaru-MATE-Light has bad highlight/contrast when using keyboard navigation

Hi, the default Yaru-MATE-Light has a quirk when using keyboard for navigation. The highlight/contrast is bad; white on grey. Please see screenshot below.

'Software and Updates' is highlighted via keyboard navigation whereas 'Software Boutique' using mouse.

This (as much as I could see) only affects Yaru-MATE-Light theme. Radiant MATE theme is OK. The dark variants are OK too.