Hyperlink drill-down in the report does not encode the URL when the drill down report name has Square Brackets.
Steps to reproduce the issue,
In Steel-wheel samples, rename any one of the report to include the Square Brackets as part of the name.
Ex: [Product] Sales.prpt
Create a simple report or use the attached report, enable the Hyper-Link on the one of the column and link it to open a report which has Square bracket as part of the file name.
We'll be able to reproduce the issue, when report is published on the server.
Refer the attached report and screenshot.