BSOD 0x7B - OBJECT_NAME_NOT_FOUND - Failed to open symlink \Device\Harddisk0\Partition1 during bootsequence after upgrade from r75013 to 0.4.15-5539

Step 1 : Install SVN-r75013 on a new VM (format to FAT32 partition) Completes successfully, and r75013 runs fine.
Step 2 : Upgrading from SVN-r75013 to reactos-bootcd-0.4.15-dev-5539-g9385830-x86-gcc-lin-dbg 
-  Systematic BSOD 0x7B during boot sequence
-  If during the last step, it is selected to reformat the FAT32 partition rather than Upgrading, the problem does not occur.

(not due to dirty FS etc...)

BOOT DRIVERS LOADED

(ntoskrnl/io/iomgr/iorsrce.c:725) Failed to open symlink \Device\Harddisk0\Partition1, Status=c0000034*** Fatal System Error: 0x0000007b

                       (0xF7655A1C,0xC0000034,0x00000000,0x00000000)

This is an OBJECT_NAME_NOT_FOUND in IopStoreSystemPartitionInformation : https://git.reactos.org/?p=reactos.git;a=blob;f=ntoskrnl/io/iomgr/iorsrce.c#l725