Unexpected U-Boot behavior when building Boot2Qt distro with Yocto

Isaias

I am working with NXP i.MX 8QuadXPlus Multisensory Enablement Kit (MEK) and I'd like to use Boot2Qt so I created Boot2Qt distro using this guide, the steps I did are:

$ git clone -b thud git://code.qt.io/yocto/meta-boot2qt.git
$ cd meta-boot2qt
$ ./b2qt-init-build-env init --device imx8qxpmek
$ export MACHINE=imx8qxpmek
$ source ./setup-environment.sh
$ bitbake -k b2qt-automotive-qt5-image.bb

After a while the image is generated, then I use the NXP manufacturing tool to flash it to the eMMC that MEK board includes:

sudo ./uuu -v -b emmc_all imx-boot-imx8qxpmek-sd.bin b2qt-automotive-qt5-image-imx8qxpmek.img

Finally Boot2Qt boots fine and I can see Neptune starting, but when I try to modify the U-Boot enviroment variables, somehow the boot partition gets corrupted.
Here is my U-Boot output

U-Boot 2018.03-imx_v2018.03_4.14.98_2.0.0_ga+g0d6d880779 (Jan 29 2020 - 17:15:28 +0000)

CPU:   Freescale i.MX8QXP revB A35 at 1200 MHz at 22C
Model: Freescale i.MX8QXP MEK
Board: iMX8QXP MEK
Boot:  MMC0
DRAM:  2.8 GiB
VService: Connection is ok on MU mu@5d230000
TCPC:  Vendor ID [0x1fc9], Product ID [0x5110], Addr [I2C1 0x50]
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from MMC... OK
[pcie_ctrlb_sata_phy_init_rc] LNK DOWN 8600000
In:    serial
Out:   serial
Err:   serial

 BuildInfo:
  - SCFW f83a2bed, SECO-FW 92ef1143, IMX-MKIMAGE dd023400, ATF 1cb68fa
  - U-Boot 2018.03-imx_v2018.03_4.14.98_2.0.0_ga+g0d6d880779

switch to partitions #0, OK
mmc0(part 0) is current device
flash target is MMC:0
Net:   eth0: ethernet@5b040000 [PRIME]
Warning: ethernet@5b050000 (eth1) using random MAC address - 5a:51:06:58:75:ab
, eth1: ethernet@5b050000
Fastboot: Normal
Normal Boot
Hit any key to stop autoboot:  0
=> setenv serverip '172.17.44.150'
=> saveenv
Saving Environment to MMC... Writing to MMC(0)... OK
=> boot
switch to partitions #0, OK
mmc0(part 0) is current device
** Unrecognized filesystem type **
** Unrecognized filesystem type **
Booting from net ...
BOOTP broadcast 1
BOOTP broadcast 2
DHCP client bound to address 172.17.44.45 (280 ms)
Using ethernet@5b040000 device
TFTP from server 172.17.44.150; our IP address is 172.17.44.45
Filename 'Image'.
Load address: 0x80280000
Loading: *
Abort
BOOTP broadcast 1
DHCP client bound to address 172.17.44.45 (35 ms)
Using ethernet@5b040000 device
TFTP from server 172.17.44.150; our IP address is 172.17.44.45
Filename 'fsl-imx8qxp-mek-rpmsg.dtb'.
Load address: 0x83000000
Loading: *
Abort
WARN: Cannot load the DT
=> fatls mmc 0
** Unrecognized filesystem type **
=>

Any tip of what I need to do to get to the modify the environment variables in U-Boot without corrupting my boot partition? or maybe I need to modify something in my recipes?

Thanks