DArray: Memory cannot GC when the variables are reassigned, causing `Out of Memory` error or halting problem

MWE:
```jl
using DistributedNext
addprocs(8)
@everywhere using Dagger

N = 1024
a = zeros(N,N,N); # 8GB

b = DArray(a); #! Repeat this, and the CPU memory keeps growing until the Julia session is killed by system
```

I have tried the followings but the memory occupation cannot decrease:
```jl
b = nothing;

GC.gc()

@everywhere GC.gc()
```

Is there a way to reuse or manually release the memory of `DArray`? I cannot find any solution in the documentation or github issues.