Steps to reproduce the issue

Install patchtester.
Patchtester asks to type in credentials and offers a link
link leads to

administrator/**QQ__QQ**index.php?option=com_config&view=component&component=com_patchtester&returnurl=aW5kZXgucGhwP29wdGlvbj1jb21fcGF0Y2h0ZXN0ZXI=#authentication_QQ__QQ_

Expected result

index.php?option=com_config&view=component&component=com_patchtester&returnurl=aW5kZXgucGhwP29wdGlvbj1jb21fcGF0Y2h0ZXN0ZXI=#authentication_

Actual result

QQ__QQ in front and back of the Link

System information (as much as possible)

Additional comments