debian btrfs-build of Odroidxu4/HC1 ends up in boot-loop

hello dear armbian developers,

building jessie or stretch with btrfs-root ends up in an boot-loop.
this is due to an wrong entry in boot.ini

setenv rootfstype "ext4"

changing it manually to "btrfs" fixed the Problem

the config I used:

KERNEL_ONLY="no"                        # leave empty to select each time, set to "yes" or "no" to skip dialog prompt
KERNEL_CONFIGURE="no"                   # leave empty to select each time, set to "yes" or "no" to skip dialog prompt
CLEAN_LEVEL="make,debs,oldcache"        # comma-separated list of clean targets: "make" = make clean for selected kernel and u-boot,
                                        # "debs" = delete packages in "./output/debs" for current branch and family,
                                        # "alldebs" = delete all packages in "./output/debs", "images" = delete "./output/images",
                                        # "cache" = delete "./output/cache", "sources" = delete "./sources"
                                        # "oldcache" = remove old cached rootfs except for the newest 6 files

DEST_LANG="de_DE.UTF-8"                 # sl_SI.UTF-8, en_US.UTF-8

# advanced
KERNEL_KEEP_CONFIG="no"                 # do not overwrite kernel config before compilation
EXTERNAL="yes"                          # build and install extra applications and drivers
EXTERNAL_NEW="prebuilt"                 # compile and install or install prebuilt additional packages
CREATE_PATCHES="no"                     # wait that you make changes to uboot and kernel source and creates patches
BUILD_ALL="no"                          # cycle through available boards and make images or kernel/u-boot packages.
                                        # set KERNEL_ONLY to "yes" or "no" to build all packages/all images

BSPFREEZE=""                            # freeze armbian packages (u-boot, kernel, dtb)
INSTALL_HEADERS=""                      # install kernel headers package

BUILD_DESKTOP="no"
BOARD=odroidxu4
BRANCH=next
RELEASE=stretch
ROOTFS_TYPE=btrfs
FIXED_IMAGE_SIZE=1888

should I open a bug on github for this?

thanks a lot
guenter