[raiguard][2.0.77] Splitter filter cannot be assigned on Steam Deck in game mode using mouse+keyboard

[lacerator]

After updating to 2.0.77, on Steam Deck in game mode, using a mouse+keyboard, I am unable to select an item filter for a splitter. Clicking the square button where an item filter (if any) for the splitter is displayed and selected does not open the the filter selection dialog/menu box.

Filters for inserters are unaffected, and function as normal.

Am on break at work, currently. Can add a log file (and save if necessary) when I return home.