Eclipse PDE UI feature export with two fragments for same os, different arch

Question

Hoping to have some Eclipse PDE guru's weigh in here in a problem I'm having trouble solving.

I am attempting export (via PDE UI) a feature that has two fragments included where both fragments target the same os (e.g., Linux) but have different architecture values (e.g., x86 and x86_64). Each fragment has their own copy of several .so library files, which were built on the either Linux x86 or Linux x86 64 bit. For example:

FragmentA (os=Linux,arch=x86)
   lib1.so
   lib2.so
   lib3.so

FragmentB (os=Linux,arch=x86_64)
   lib1.so
   lib2.so
   lib3.so

Exporting the hosting feature with using the corresponding delta pack to select either linux (gtk/x86) OR linux (gtk/x86_64), the export works as expected. However, when I select BOTH platforms, the export fails with the following message:

Processing inclusion from feature com.sample.feature:
    Bundle com.sample.linux.x86_64_1.0.0.qualifier failed to resolve.:
    Unsatisfied native code filter:
        lib1.so; lib2.so; lib3.so; processor=x86_64; osname=linux.

Why can't I export both fragments together? I also have a Win32 x86 fragment that I can export with the linux X86 feature but instead of having .so files, it has .dll files with the same file titles (e.g., lib1.dll, lib2.dll, lib3.dll).

Could having .so library files named the same in the two Linux-based fragments cause this issue?

Any help would be much appreciated as this is a critical block to our build process (both manually via the UI and headlessly).