Expanding volume on basic disk on Hyper-V replicated cluster

Hi,

I expanded a disk for a VM in Hyper-V. Now I need to expand the volume but it has no contiguous space and it's a basic disk. Windows suggests to convert it to a dynamic disk but I heard that it might not be such a good idea to convert it to a dynamic disk. 

Is it true that there is a risk in converting it to dynamic? And if so, how can I proceed? The volume needs urgent expanding.

Thanks for your help!