Cannot build b2qt 6.4.2 distro with linux-fslc-imx kernel

We can no longer build distro with "linux-fslc-imx" kernel in b2qt 6.4.2. The "linux-imx" kernel is always used instead. It was working well in b2qt 6.4.1.

Forcing kernel version in local.config is always ignored:

PREFERRED_PROVIDER_virtual/kernel = "linux-fslc-imx"

It looks like is is caused by commit 58e6a5feecc5b511e7ebeb13abc879ef51d4530a in meta-boot2qt:

https://code.qt.io/cgit/yocto/meta-boot2qt.git/commit/?h=6.4.2&id=58e6a5feecc5b511e7ebeb13abc879ef51d4530a

The following lines of the commit force yocto to use "linux-imx" kernel for the build:

 
+# Use NXP BSP and u-boot for default (meta-freescale-distro)
+IMX_DEFAULT_BSP = "nxp"
+IMX_DEFAULT_BOOTLOADER:imx-nxp-bsp = "u-boot-imx"
+PREFERRED_PROVIDER_virtual/kernel:imx-nxp-bsp = "linux-imx"