svg <title> does not include whole puml title

Question

in this example:

@startuml

title line 1\nline2

Bob -> Alice : hello
@enduml

only line 1 will get into svg title: <title>line 1</title>

Please have a look: https://www.plantuml.com/plantuml/svg/SoWkIImgAStDuU8goIp9ILN8oSnBLJ2CoGFHHbnSJlb92hfs2euvcScf2bOA6QavEVbS3gbvAK0j0000

Should be:

<title>line 1
line 2</title>