Test Card appears in Premiere Pro & After Effets after editing a medium-large project

Hey guys,

Firts time posting for me so be gentle but I am currently editing a 3-4 minute video and been using dynamic link between PP & AE to remove some significant dust spots and colour replacement/grading. Now all of a sudden I have getting the colour tv screen/test card show on a clip on both apps. Unsure what this means and I have turned colour management on/off with no result. The clip specifically is overexposed but I dont think this would be an issue?

Looking for any guidance as there isn't much out there I can find.

Thanks!