cotton
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cotton's post in ScrollTrigger toggle class of a related element not firing was marked as the answer
Really silly error that I missed to fix this.
The panels/sections were 100vh so were ending the trigger as soon as it had started so just needed to alter the 'start' and 'end' positions.
See the Pen OJoaZXW by Cottonltd (@Cottonltd) on CodePen