xtrabackup 2.3.2 leaves temporary directories behind in streaming mode

After upgrading to 2.3.2, we are seeing empty temporary directories of the form YYYY-MM-DD_HH-MM-SS left behind in the directory specified as the directory argument to innobackupex and as for incrementals when running streaming backups. Anybody else?

Full command line:

I'm aware that innobackupex is going away but our existing tooling still invokes innobackupex.