The exception is for metadata with
name==“file_delayed_load”
typeName=="__delayedload"
Even for the file WITHOUT blosc from your archive, the blosc decompressor is executing for this metadata.
The compression type is BLOSC_LZ4_FORMAT
Unfortunately, my version of sources were compiled without this support (only the standard BLOSC_BLOSCLZ_FORMAT was enabled by default).
I will try to enable this LZ4.