Compressed block of one sequence with matchlength token > 0 does not fail.

Hello!

When I pass a compressed block like: {0x54, 0x00, 0x00, 0x00, 0x00, 0x00} to the LZ4_decompress_safe function, it decompresses it without error, even though the matchlength should, strictly speaking, be zero. I haven't found anything in the block format description regarding this, is it allowed? Thank you for the help!