Are all aac files non-seekable or I missed something?

I tried to import an aac file which I detached from a MP4/M4A file by FFMPEG, but Shotcut 24.08.29 showed it is non-seekable and refused to import.
Then I tried the MP4/M4A file and it was fine.
(But I still prefer AAC files because some of my old hardwares only recognize AAC file)

Are all aac files non-seekable or I missed something when detaching? I used this to detach.

ffmpeg -i waterfront.m4a -vn -acodec copy waterfront.aac

Yes. Raw AAC does not have any header information or index. And the frames are variable size. So Shotcut can not accurately seek to a specific position in the file.