[Bug] Runtime Error: invalid memory address or nil pointer dereference for newJarGetter()

I'm getting an error initializing Apache Beam for my Go service deployed to kubernetes. The error in question is:
```panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0xb94949]

goroutine 1 [running]:
github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime/xlangx/expansionx.newJarGetter()
/go/src/groups/vendor/github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime/xlangx/expansionx/download.go:50 +0x29
github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime/xlangx/expansionx.init()
/go/src/groups/vendor/github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime/xlangx/expansionx/download.go:40 +0x17
```

Looking at the code, it seems like the culprit is `usr` in
```
cacheDir := filepath.Join(usr.HomeDir, jarCache[2:])
```
I am wondering if there is a potential bug or problem with `usr, _ := user.Current()` in the line before.