Has chrome incognito mode changed how it handles cookies?

I use a proxy to access the board because my IP address is typically blocked. The proxy usually starts giving errors after some browsing if cookies weren’t deleted, so I started using incognito mode, since that would automatically wipe cookies after browsing. This no longer seems to be true. The same cookie errors show up even after restarting Chrome. For further confirmation I tried reading articles on sites like NYTimes and the Economist, who use cookies to enforce reading limits and could earlier be worked around by using incognito mode. These too no longer reset the ‘read count’ after restarting the browser’s incognito mode. Has there been a change in how Chrome handles cookies in incognito?

ETA: Private browsing in Firefox still handles things how I would expect. No errors on the proxy, and no reading limits