Dropped frames when using frame threads on some scalable samples

[jamrial@ArchVM tools]$ ./dav1d --framethreads 1 -i ../../tests/dav1d-test-data/8-bit/svc/av1-1-b8-22-svc-L2T1.ivf --alllayers 0 --oppoint 1 --muxer md5 -o -
dav1d 36b807a - by VideoLAN
Decoded 8/8 frames (100.0%)
1e595312e1cebf280a4dc65e84f07544
[jamrial@ArchVM tools]$ ./dav1d --framethreads 2 -i ../../tests/dav1d-test-data/8-bit/svc/av1-1-b8-22-svc-L2T1.ivf --alllayers 0 --oppoint 1 --muxer md5 -o -
dav1d 36b807a - by VideoLAN
Decoded 6/8 frames (75.0%)
d8519b2495f1928ee9a1e9327b6ee002
[jamrial@ArchVM tools]$ ./dav1d --framethreads 4 -i ../../tests/dav1d-test-data/8-bit/svc/av1-1-b8-22-svc-L2T1.ivf --alllayers 0 --oppoint 1 --muxer md5 -o -
dav1d 36b807a - by VideoLAN
Decoded 4/8 frames (50.0%)
aa25b146da40a721467d1e236ea5c921

[jamrial@ArchVM tools]$ ./dav1d --framethreads 1 -i ../../tests/dav1d-test-data/8-bit/svc/av1-1-b8-22-svc-L2T2.ivf --alllayers 0 --oppoint 2 --muxer md5 -o -
dav1d 36b807a - by VideoLAN
Decoded 8/8 frames (100.0%)
8443d3cacdcee6b7ee3d699013845525
[jamrial@ArchVM tools]$ ./dav1d --framethreads 2 -i ../../tests/dav1d-test-data/8-bit/svc/av1-1-b8-22-svc-L2T2.ivf --alllayers 0 --oppoint 2 --muxer md5 -o -
dav1d 36b807a - by VideoLAN
Decoded 6/8 frames (75.0%)
ceb86325a26ab5ffcf915e6098625782
[jamrial@ArchVM tools]$ ./dav1d --framethreads 4 -i ../../tests/dav1d-test-data/8-bit/svc/av1-1-b8-22-svc-L2T2.ivf --alllayers 0 --oppoint 2 --muxer md5 -o -
dav1d 36b807a - by VideoLAN
Decoded 4/8 frames (50.0%)
6ec26f73d42300e2f0846c974489b92d

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