error when closing a netcdf4 file

I encountered a problem with a netcdf4 file. (NetCDF-C 4.9.0 is used.)
A short test program "test.c" is given below. It opens and closes a file.
```
#include
#include
#include
#include

int main(int argc, char *argv[])
{
int err, ncid;

if (argc != 2) {
printf("Usage: %s filename\n",argv[0]);
return 1;
}
err = nc_open(argv[1], NC_NOWRITE, &ncid);
assert(err == NC_NOERR);
err = nc_close(ncid);
assert(err == NC_NOERR);
return 0;
}
```
Run this test program to open file [map_g_case_16p.nc4](https://github.com/Parallel-NetCDF/E3SM-IO/blob/master/datasets/map_g_case_16p.nc4)
```
% gdb test
(gdb) run map_f_case_16p.nc4
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff14626a2 in H5VL_cache_ext_dataset_close (dset=0x6b1a60, dxpl_id=792633534417207304,
req=0x0) at /files2/scratch/vol-cache/src/H5VLcache_ext.c:3387
3387 while (p->parent != NULL)
(gdb) print p
$1 = (H5VL_cache_ext_t *) 0xa1
(gdb) print p->parent
Cannot access memory at address 0xf9
```