Changing wallet password using double quotation marks turn out to be mysterious (Qtum Core)

I installed Qtum core in my Ubuntu 16.04 server and generated my wallet, and encrypted it.

For the test purpose, I changed the password using the command like below.

I typed below command to change my password.

./qtum-cli walletpassphrasechange "oldpassphrase" "newpassphrase"

Let's say my oldpassphrase is test and my new passphrase is test"

Notice that I type the double quotation mark right after the word test

./qtum-cli walletpassphrasechange "test" "test""

This returns below line that asks me to close the double quotation mark.

>

So I typed " to close it.

Surprisingly, the command line has passed!

I thought the new password would be test" or test""

But they both do not work.

Can anyone guess what the new password might be?

http://ift.tt/2hWorRZ

Cryptocurrency expert here!