Reading coregistered TanDEM-X DRA products throws exception


I tried to open some coregistered products from TanDEM-X.
I got a null pointer exception when trying any *COS_*_Q_DRA product, while the individual *SSC_*_Q_DRA* are working perfectly. Other coregistered products like *COS_BIST_SM_S_SRA* and *COS_BIST_SM_D_SRA* are also working.

Tested on the following configuration:
Ubuntu 14.04 and 16.04 on an intel core i7 with 16GB of RAM,
SNAP 3.0.1, S1TBX 3.0.1
with JAVA 1.8.0_60-b27 (as reported by SNAP)

Does anyone have an idea?

TanDEM-X bistatic CoSSCs are supported but not DRA