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#10
Yeah; mine is 100 MB also. I've never had any update issues related to size. Windows has always expanded the partitions as it saw fit or in some cases made a brand new partition.
My EFI partition shows as 100 percent free space although I certainly assume it contains something.
I don't think your problem is uncommon, just going from memory.
I show 4 partitions in Disk Management and 5 in Macrium.......all of which I have never personally altered. It's all Windows own doing.