I have a WordPress Multisite (Network), and two of the sites actually have masked domains that are completely different from the main site. All of the subsites are subdomains, so I have abc.mysite.com masked by myawesomesite.com.

These are the only two sites that never finish loading when I try to get to them via Chrome, and I always see the “A cookie associated with a cross-site resource at…was set without the SameSite attribute” (in the Developer Tools Console). This is after I installed the plugin. After several minutes, one of them gave the error “Incorrect or out of date login key,” but this error was on the page itself.

Is this something to do with the plugin, something else related to the cookie situation, or something else altogether?