5.1.0 cannot log in to SE

[Papershine]

I upgraded to 5.1.0 today and I cannot log in with the following error

SwiftChatSE.Client.LoginError.loginFailed: file /BuildRoot/Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-902.0.54/src/swift/stdlib/public/core/ErrorType.swift, line 184

It worked completely fine before, so I tried downgrading to 5.0.7, and interestingly, the bot could now log in successfully. Is this just a coincidence? When I upgraded back to 5.1.0, it failed again, and when I downgraded for the second time, it worked.

[Papershine]

I see

if !cookies.contains(where: { $0.name == "acct" && cookieHost(host.domain, matchesDomain: $0.domain) }) {
    throw LoginError.loginFailed
}

being added in 5.1.0, is that a problem?