Alternate decoder binaries fail to read OBU headers in v11

Reproduce with on research-v11.0.0 with:

./aomenc FourPeople_480x270_60.y4m --output=fourpeople_235.obu --tile-columns=0 --threads=1 --cpu-used=0 --enable-intrabc-ext=2 --passes=1 --kf-min-dist=0 --kf-max-dist=0 --use-fixed-qp-offsets=1 --deltaq-mode=0 --enable-tpl-model=0 --enable-keyframe-filtering=0 --obu --limit=1 --end-usage=q --psnr=2  --qp=235 --cpu-used=0

This seems to affect all of the non-aomdec decoder binaries:

examples/simple_decoder fourpeople_235.obu /dev/null
file_type: OBU size is required
Failed to open fourpeople_235.obu for reading.
Usage: examples/simple_decoder <infile> <outfile>

examples/scalable_decoder fourpeople_235.obu 
Using AOMedia Project AV1 Decoder 11.0.0
Input is not a valid obu file: Success

./extract_proto --stream fourpeople_235.obu --output_folder /tmp
file_type: OBU size is required
F0917 10:39:50.728605 2251750 extract_proto.cc:1087] Check failed: OpenStream(&ctx) is OK (NOT_FOUND: Failed to open fourpeople_235.obu for reading.) 
*** Check failure stack trace: ***
Aborted (core dumped)