HeidiSQL+plink and SSH passphrase escaping

SSH tunneling with HeidiSQL currently fails if the SSH password/passphrase contains one or more double quote (") characters because they do not get escaped. This issue cost me quite a few hours and I found that several other people have probably run into this exact problem as well (e.g. here and here).
Is this a known behavior? Or can this be fixed by properly escaping double quotes in the password?

SSH password is currently just surrounded by "doublequotes". I can of course fix that, if someone tells me how to escape passwords and/or usernames for plink. I just googled around but could not find something helpful.