open_grid.x crashing in us_exx.f90/rotate_becxx when using PAW-PPs (v6.3 to git/develop)

Hello, I'm currently trying to extract a bandstructure diagram from a hybrid calculation. Following this, I'm currently stuck at the "grid expansion", where open_grid.x does consistently segfault with all qe-version from 6.3 up to the freshly compiled develop-tree from gitlab when using PAW-PPs. It runs fine with plain NC-PPs, enabling hdf/classic output makes no difference.

Sample error message:

Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

Backtrace for this error:
#0  0x7f1422da0f3f in ???
#1  0x48fa46 in __us_exx_MOD_rotate_becxx
        at /tmp/fmm/spack-stage/spack-stage-ZII7dY/q-e-qe-6.4.1/PW/src/us_exx.f90:773
#2  0x42e4d6 in __exx_MOD_exxinit
        at /tmp/fmm/spack-stage/spack-stage-ZII7dY/q-e-qe-6.4.1/PW/src/exx.f90:725
#3  0x408785 in open_grid
        at /tmp/fmm/spack-stage/spack-stage-ZII7dY/q-e-qe-6.4.1/PP/src/open_grid.f90:148
#4  0x4081ec in main
        at /tmp/fmm/spack-stage/spack-stage-ZII7dY/q-e-qe-6.4.1/PP/src/open_grid.f90:5
Segmentation fault (core dumped)

Attached find a sample file, using the PSlibrary-pseudos: gan.pwi (im just running pw.x on it, followed by open_grid.x)