Building custom image fails - cannot find "dtbs" in kernel info

[ogra]

please see:

Changes in pi/pi-kernel DTB handling

Dear Ubuntu Core Raspberry Pi community, The latest snapd 2.50 release (that is currently being released) contains a new feature that allows the gadget snap to reference DTB files that are part of the kernel snap. This fixes a long-standing issue that formerly required synchronous kernel and DTB updates. The snapd version for this feature is in its stable channel, while the required pi gadget and pi-kernel kernel snaps are currently in their respective beta channels. If you wish to test this f…