Encoding error with Media Encoder vs PP encoding

HLG3 is the gamma, Rec. 709 is the color space. In Sony cameras, you can set HLG3/Rec. 709. The other option is HLG3/BT2020 color space which I don't like using as the colors are not as nice as Rec. 709.

HLG3 ... and Rec.709 ... aren't the same. As those are two very different color spaces.

So your respons is puzzling.

Sorry...no adjustment layers...there are graphic and image layers as well as the ClosedCaption text layer. All colour correction is done on the clips in the bin.

Ok...noted. Both cameras are the same resolution, file type, colour and gamma space...HLG3/Rec.709...the offending clip is from an FX30, the other cam's clips are fine and they are from an a6700. Very, very similar Lumetri, etc. adjustments and effects are applied to both. Both have a frame fix overlay (which I've determined is rendering properly...it's just the brightness of the mis-rendered clip that made me think a layer was not being rendered). I can get by exporting within PP...it's just that I often batch export numerous timelines through ME.

No...both clips in the project are HLG3/Rec709 with color space override set to Rec709 for both clips. Timeline playback is fine, exporting in PP is fine, ME is obviously misinterpreting the color space of just one of the cameras clips. A cam was FX30 - that's the one causing issues. B cam was a6700. I was mistaken in thinking one layer was not rendering...what I'm seeing is the frame fix on the left as it should be over top of the overly bright FX30 footage. Make sense? Something is going wonky when the project gets sent over to ME. I'm confused as to why only one camera's clips are affected...is there something about the FX30 footage metadata???

What color management settings are you using?

And is this the only HDR, probably HLG, clip in that project/sequence?

I have not worked on the project since Oct 22 2024 so if 25 was out at that point, then 25 was fine. If 24 was current at that point,then I'll need to understand how to downgrade 25.1 to 25. Can you let me know how to do that? TIA

I used an online tool to downgrade the project and opened it in 24. Sending it ME 24 shows no errors...it's fine. So the issue is with PP 25 and ME 25.