Workaround
By going to “External sources » PDF and Images » OPS” like depicted here
[…]
you can explicitly request the PDF document from OPS, in turn yielding a placeholder document [1,2] displaying a reference to the document WO 2012/153305.
[1] https://patzilla.ip-tools.io/api/ops/EP2706864A2/pdf/all
[2] EP2706864A2.pdf (14.7 KB)