Error: EOF marker is absent. The input is probably truncated

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Tabix may generate this warning when indexing a bgzip-compressed file written by OmicSoft products

tabix -p vcf OS.created.output.vcf.gz
[W::bgzf_read_block] EOF marker is absent. The input is probably truncated

This is generally a false error because tabix is expecting the file to have been compressed with a version of bgzip more recent than the one implemented within OmicSoft products. As long as a .tbi file is written, it should be a valid index file.