First party cookies "disappearing"

I'm seeing my first party cookies "disappear" on a couple of sites right now, prematurely logging me out:

I'm not running any extensions. I'm not clearing anything on purpose. Single (default) profile.

Normal settings on each site are enabled:

My cookies to not magically disappear.

0.99.126-rc (WebKit 618.1.2)

Sonoma (14)

spicysalmon not able to reproduce. we'll need steps to reproduce from a new clean orion profile