Actually, Phillip, BtrFS requires 2MB for a Grub2 installation.  So, while you 
are correct that it does start at 1MB, the partitioner does have an error in 
not including that the rules for BtrFS are different.  The normal 1MB is a part 
of the normal MBR rules.  Since Grub2 requires some extra installation space 
for the BtrFS partition information, GParted should warn when BtrFS is used and 
a partition is started less than 2MB from the beginning of the drive.  For 
everything else, 1MB works fine.
So, this would be a problem with the partitioner not realizing the rules are 
different and the installer not seeing that the partitioner made a mistake and 
that Grub2 can not be properly installed inside of the 1MB space for a BtrFS 
partition.

Ext4 and other partitions that are not BtrFS have no problem with the
1MB start point.

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https://bugs.launchpad.net/bugs/1059827

Title:
  Non trivial grub2 installs no longer fit in small embed areas

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