[Bug]: Unexpected String-representation of system stream in formatted output

[sormuras]

What happened?

The following statements

System.out.println("| " + Runtime.version());
System.out.printf("| %s%n", Runtime.version());

lead to

| 21+35-LTS-2513
java.io.PrintStream@314c508a| 21+35-LTS-2513

which contain an unexpected java.io.PrintStream@314c508a output (the value returned by System.out.toString()) start of the second one.

OS

Other

What browsers are you seeing the problem on?

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Additional information

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