Hello,
This is an older problem as described in this post
https://community.adobe.com/t5/adobe-media-encoder-discussions/estimated-file-size-issue/m-p/9412143...
But the bug itself if that when the Metadata option is set to ""create sidecar file" in the export settings box in Media Encoder the program still writes the Metadata INSIDE the file.
The other 2 options that are always greyed out are write Embed in Output File and Create sidecar AND Embed in Out file.
This is s H264 file that we are talking about.
Media Encoder 23 and the latest 24 both behave the same.
Thanks.
The only option is to turn it off.
Turning it off also solves that dreaded size bloating of the file which took me couple of hours today to figure out.