Jerboa icon gained a white background?

This morning when I picked up my phone, the Jerboa icon on my phone's homepage had a transparent background, as it had when first installed a week-or-so ago.

Sometime, mid-day today, I saw the icon had a solid white background.

Did this change as a result of an update, or maybe my (admittedly old) phone just catching up to 2023?

I must admit, I kinda liked the transparent-background version.