Style parsing doesn't work when the entire line is styled

[TheSolarPrincess]

Describe the bug
If the entire line is italic/bold/underscore, the style isn't parsed correctly

To Reproduce
Steps to reproduce the behavior:

This is the .org file:

This is /styled text/ in the middle of the line

/This is the entire line styled/

This is what it parses into

;; => [:S
;;     [:content-line
;;      [:text
;;       [:text-normal "This is "]
;;       [:text-sty-italic "styled text"]
;;       [:text-normal " in the middle of the line"]]]
;;     [:empty-line]
;;     [:content-line
;;      [:text
;;       [:text-normal "/This is the entire line styled"]
;;       [:text-normal "/"]]]]

Expected behavior
The second line is put entirely within the :text-sty-italic block