output has been done using
OutputInterface::OUTPUT_PLAIN. This call an
Problem with diagnostics output is, that at tries to print
--> Please delete these directories to prevent errors. <--
strip_tags cuts it of at
<-- as it's detected as comment/tag.
The output now uses
OutputInterface::OUTPUT_NORMAL, which doesn't do a
strip_tags. Instead the tag removal is done manually using a preg_replace.