I see this panic while building the uc22 image. Ubuntu image is built from master. This is trying to build using snapd from master too.
/home/gopath/bin/ubuntu-image snap --image-size 10G --validation=enforce /home/gopath/src/github.com/snapcore/snapd/tests/lib/assertions/developer1-22-signed.model '' --output-dir /tmp/work-dir/images --sector-size 512 --snap /tmp/extra-snaps/pc-kernel.snap --snap /tmp/extra-snaps/snapd-from-deb.snap --snap /tmp/extra-snaps/core22.snap --snap /tmp/extra-snaps/pc_22-0.4_amd64.snap
2023-09-12T18:50:40.2848542Z [0] make_temporary_directories
2023-09-12T18:50:40.2848775Z [1] determine_output_directory
2023-09-12T18:50:40.2848961Z [2] prepare_image
2023-09-12T18:50:40.2849046Z [3] load_gadget_yaml
2023-09-12T18:50:40.2849268Z panic: runtime error: invalid memory address or nil pointer dereference
2023-09-12T18:50:40.2849527Z [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xc9f02d]
2023-09-12T18:50:40.2849538Z
2023-09-12T18:50:40.2849665Z goroutine 1 [running]:
2023-09-12T18:50:40.2850034Z github.com/canonical/ubuntu-image/internal/statemachine.(*StateMachine).postProcessGadgetYaml(0xc0001b5200)
2023-09-12T18:50:40.2850358Z /home/test/src/github.com/canonical/ubuntu-image/internal/statemachine/state_machine.go:286 +0x8ad
2023-09-12T18:50:40.2850901Z github.com/canonical/ubuntu-image/internal/statemachine.(*StateMachine).loadGadgetYaml(0xc0001b5200)
2023-09-12T18:50:40.2851350Z /home/test/src/github.com/canonical/ubuntu-image/internal/statemachine/common_states.go:107 +0x23d
2023-09-12T18:50:40.2851765Z github.com/canonical/ubuntu-image/internal/statemachine.(*StateMachine).Run(0xc0001b5200)
2023-09-12T18:50:40.2852169Z /home/test/src/github.com/canonical/ubuntu-image/internal/statemachine/state_machine.go:415 +0x151
2023-09-12T18:50:40.2852357Z main.executeStateMachine(0xc00039dea0, 0xc00039e1c0, 0xc0001415f0)
2023-09-12T18:50:40.2852815Z /home/test/src/github.com/canonical/ubuntu-image/cmd/ubuntu-image/main.go:52 +0x2ea
2023-09-12T18:50:40.2853020Z main.main()
2023-09-12T18:50:40.2853349Z /home/test/src/github.com/canonical/ubuntu-image/cmd/ubuntu-image/main.go:157 +0x6fa
2023-09-12T18:50:40.2853529Z -----
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