Prerendert mp4 replace with RAW DNG in After Effects

Question

Hello,
I try to replace a mp4 clip with RAW DNG. The mp4 clip was made from the RAW DNG, but when I try to replace it, the length of the clip never fits.
Details:
1. RAW DNG recorded with 30fps
2. RAW DNG with Media Encoder to 30 fps mp4 rendered
3. mp4 import to AE
4. Replace mp4 with RAW DNG
Result:
mp4 clip length = 08:19:12
DNG RAW length = 06:39:04
The info window shows bith clips with 30fps .
Both clips shows: 0000000-0011973 (frame count from dng raw )
All Settings on 30fps:
Media Encoder: "Media / Indeterminate Media Timebase: 30fps"
After Effetcs: "Import / Sequence Footage 30 fps"
Premiere. " Media / Indeterminate Media Timebase: 30fps" (just in case  - maybe encoder reference pp..i dont think so..but..)
What can I do? Im doing something wrong, or is it a software error?
Even if I dont replace, just import the raw dng to AE it show the shorter lenght, but as well 30fps in the info window.

Answer 1

I did a testfile.
I exported a clip (30fps) to png sequence (60fps) and add it to the media encoder and when I press the button "match source" Media Encoder shows me (again) 23,976fps, but when I manually put it on 30fps it really export with 30fps. So I have a mp4 with 30fps
So I import that mp4 to AE its 03:29, when I import the pngs itself directly to AE its 03:29. So my setting seems to be correct. I choose the same settings importing RAW DNG.
I recognize that Media Encoder doesn`t recognize that the RAW DNG is a picture sequence, in the import window the "import sequenze square" is grey out, but it imports it as a the picture sequence, but not with the correct fps.
Its confusing, because it shows in the the clip info, after rendering the correct fps (30fps), but its not 30fps , its more like 23,976 frames. So it really looks that its a adobe software error.
Is it?