Tar recovery chokes on bulk segments

16:15:35.155 [main] WARN  o.a.j.oak.segment.file.tar.TarReader - Unable to load index of file data00000a.tar: Unrecognized magic number
16:15:35.162 [main] WARN  o.a.j.oak.segment.file.tar.TarReader - Could not find a valid tar index in /Users/mduerig/Downloads/l9/crx-quickstart/repository/segmentstore/data00000a.tar, recovering read-only
java.lang.IllegalArgumentException: invalid segment buffer
    at org.apache.jackrabbit.oak.segment.data.SegmentDataLoader.newSegmentData(SegmentDataLoader.java:37)
    at org.apache.jackrabbit.oak.segment.data.SegmentData.newSegmentData(SegmentData.java:66)
    at org.apache.jackrabbit.oak.segment.file.AbstractFileStore.writeSegment(AbstractFileStore.java:212)
    at org.apache.jackrabbit.oak.segment.file.AbstractFileStore.access$000(AbstractFileStore.java:66)
    at org.apache.jackrabbit.oak.segment.file.AbstractFileStore$1.recoverEntry(AbstractFileStore.java:125)
    at org.apache.jackrabbit.oak.segment.file.tar.TarReader.generateTarFile(TarReader.java:213)
    at org.apache.jackrabbit.oak.segment.file.tar.TarReader.openRO(TarReader.java:162)
    at org.apache.jackrabbit.oak.segment.file.tar.TarFiles.<init>(TarFiles.java:298)
    at org.apache.jackrabbit.oak.segment.file.tar.TarFiles.<init>(TarFiles.java:58)
    at org.apache.jackrabbit.oak.segment.file.tar.TarFiles$Builder.build(TarFiles.java:167)
    at org.apache.jackrabbit.oak.segment.file.ReadOnlyFileStore.<init>(ReadOnlyFileStore.java:74)
    at org.apache.jackrabbit.oak.segment.file.FileStoreBuilder.buildReadOnly(FileStoreBuilder.java:383)