Broken Netbeans C++ code completion in Debian sid

When I use the workaround I wrote about for Netbeans crashing on startup in Debian sid, I notice that some C++ code completion doesn't work as expected. In several classes I've tried writing, code completion isn't picking up stuff declared in the header file.

When I use a copy of Oracle Java downloaded just for NB (i.e., netbeans_jdkhome="/home/me/opt/oracle-java/jre1.8" in /home/me/opt/netbeans/etc/netbeans.conf), things work as expected.

Whether this is a different or related bug I can't say, but I thought it worth mentioning in case anyone else is having the same problem.