BLAST+ 2.2.29 upset by [key=value] entries in queries

I recently got a weird error/warning message (repeated) in my BLAST+ stderr output,

Error: (1431.1) FASTA-Reader: Warning: FASTA-Reader: Ignoring FASTA modifier(s) found because the input was not expected to have any.

This turns out to be due to having [key=value] tags in my query FASTA file, and appears to be a new bug introduced in BLAST+ 2.2.29 (as BLAST+ 2.2.26 through 2.2.28 inclusive are not affected).

Update (31 October 2014): This was fixed in BLAST+ 2.2.30 (released yesterday).