When activating or deactivating a resource pack, the formatting in toast notifications extends to regular text

When activating or deactivating a resource pack, the formatting in toast notifications extends to regular text.

Expected Results:
This is §aGreen§r activated
This is §aGreen§r deactivated

Actual Results:
This is §aGreen activated
This is §aGreen deactivated

Screenshots/Videos:
Showcase of bug in action: https://youtu.be/Ajq4dlA-JPk

Toast Color Notification Bug.mcaddon is the resource pack that was featured in the video.