import-from behaves differently when imported symbol does not exist in the source package

Tried in SBCL:

(uiop:define-package #:P0)
(uiop:define-package #:P1 (:import-from #:P0 #:sym0))

Executing above interns SYM0 into P0.

(defpackage #:P0)
(defpackage #:P1 (:import-from #:P0 #:sym0))

Executing above raises an error with the option to intern. Shouldn't uiop:define-package behave same as defpackage?