Single POST auth with OTP no longer supported?

Previously (in 7.x at least), you were able to include otp in a single request to /api2/json/access/ticket which would verify both the username/password and TOTP token and immediately provide a ticket and CSRF token. However, this appears to no longer work and requires the two-request flow the GUI uses involving the tfa-challenge.

Is the single-request TOTP purposefully no longer supported or would it be expected for this to still work and should have a bugzilla bug opened...

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