Issue with 1-RDM calculation using VMC for molecules

**Describe the bug**
I am trying to compute the 1-RDM of a H2 molecule under STO-3G basis from VMC runs, by setting the Hamiltonian block in the input file as the following. The vmc run ends successfully and produced the .stat.h5 file with a "DensityMatrices" of size (200,2,2) with all entries being 0. Two questions:
1) The 1-RDM under STO-3G basis should be of size 2x2, and I don't understand why the stat.h5 file contains a (200,2,2) object;
2) Why all entries of the stat.h5 file are zero?

Is something wrong with my input? I am attaching all the input files below.

```


updet downdet
matrix
uniform_grid
10
1.0
0 0 0





```

```


100
200
50
8
0.5
no

16000

```

**To Reproduce**
Steps to reproduce the behavior:
I am running qmcpack as a docker container (williamfgc/qmcpack-ci:ubuntu20-openmpi) as in https://qmcpack.readthedocs.io/en/develop/running_docker.html. It passes all unit tests.

Run `qmcpack input.xml`

**Expected behavior**
Will generate stat.h5 file which is supposed to contain the 1-RDM.

**Additional context**
Only using J2 factor in this case for simplicity. The PySCF script used to generate the wave function file is also attached.
[h2_test.zip](https://github.com/QMCPACK/qmcpack/files/9570213/h2_test.zip)