Site platform changed to Launch, GCM floodlights working but dynamic pixels within them not

Hello,

My client uses Google Campaign Manager for an end advertiser and has floodlights set up in the client's tag management system to track. Our pixels are placed in the GCM floodlights. The end client recently switched to Launch, and the GCM floodlights seem to be working fine, but our pixels within them seem to be broken. Our daily loads on our pixels have dropped significantly from 100's of thousands per day to a little over a thousand.

I think something in the waterfall of Launch-GCM-our DSP pixels is not playing nicely. The end client dev team is completely stumped. Would you be able to advise?

Thank you!