When using the seek functionality for RAW input as described in
The code on line 397-398 will push the suggested value of -1 to 0 which will disable the SEEK_END.
The fix would be to make the test if offset < -1, or to remove it in its entirety.
running bin/bro version 2.4-87-debug on linux
Alternatively, you could simply choose between SEEK_SET and SEEK_END, before you optionally increment offset.
Edit: Never mind. You were posting the fix about the same time as I was posting my comment.
This is fixed in topic/johanna/bit-1479