And a different occurence of the same error message on https://jenkins.juju.canonical.com/job/RunUnittests-arm64/1843/consoleFull, this time a cmd_juju_controller_test.go:306: cmdControllerSuite.TestControllerDestroy failed with the above message and cmdControllerSuite.TestControllerDestroyUsingAPI failed with 
18:58:58 [LOG] 0:07.175 INFO juju.testing reset successfully reset admin password
18:58:58 cmd_juju_controller_test.go:341:
18:58:58     c.Check(err2, jc.ErrorIsNil)
18:58:58 ... value *errors.Err = &errors.unformatter{message:"", cause:(*errors.errorString)(0x4000ad7e90), previous:(*errors.Err)(0x400022f860), file:"github.com/juju/juju/state/state.go", line:262} ()
18:58:58 ... error stack:
18:58:58 	failed to reload transaction: not found
18:58:58 	github.com/juju/juju/state/state.go:308: 
18:58:58 	github.com/juju/juju/state/state.go:262: 
18:58:58 
18:58:58 cmd_juju_controller_test.go:339:
18:58:58     c.Check(err, jc.ErrorIsNil)
18:58:58 ... value *errors.Err = &errors.unformatter{message:"", cause:(*errors.notFound)(0x4000f0bae0), previous:(*errors.Err)(0x4000f0bb80), file:"github.com/juju/juju/state/undertaker.go", line:23} ()
18:58:58 ... error stack:
18:58:58 	github.com/juju/juju/state/model.go:870: model "b4e24c33-10f3-4dfd-8067-4896e5c3ed42" not found
18:58:58 	github.com/juju/juju/state/model.go:200: 
18:58:58 	github.com/juju/juju/state/undertaker.go:23: 
18:58:58 
18:58:58 cmd_juju_controller_test.go:341:
18:58:58     c.Check(err2, jc.ErrorIsNil)
18:58:58 ... value *errors.Err = &errors.unformatter{message:"", cause:(*errors.notFound)(0x40013914a0), previous:(*errors.Err)(0x40013914f0), file:"github.com/juju/juju/state/state.go", line:247} ()
18:58:58 ... error stack:
18:58:58 	github.com/juju/juju/state/model.go:870: model "b4e24c33-10f3-4dfd-8067-4896e5c3ed42" not found
18:58:58 	github.com/juju/juju/state/model.go:200: 
18:58:58 	github.com/juju/juju/state/state.go:247: 
18:58:58 
18:58:58 [LOG] 0:07.635 DEBUG juju.rpc error closing codec: write tcp 127.0.0.1:37402->127.0.0.1:33746: write: broken pipe
18:58:58 [LOG] 0:07.636 INFO cmd command finished
18:58:58 cmd_juju_controller_test.go:339:
18:58:58     c.Check(err, jc.ErrorIsNil)
18:58:58 ... value *errors.Err = &errors.unformatter{message:"", cause:(*errors.notFound)(0x4000c90500), previous:(*errors.Err)(0x4000c90550), file:"github.com/juju/juju/state/undertaker.go", line:23} ()
18:58:58 ... error stack:
18:58:58 	github.com/juju/juju/state/model.go:870: model "b4e24c33-10f3-4dfd-8067-4896e5c3ed42" not found
18:58:58 	github.com/juju/juju/state/model.go:200: 
18:58:58 	github.com/juju/juju/state/undertaker.go:23: 
18:58:58 
18:58:58 cmd_juju_controller_test.go:341:
18:58:58     c.Check(err2, jc.ErrorIsNil)
18:58:58 ... value *errors.Err = &errors.unformatter{message:"", cause:(*errors.notFound)(0x4001492d20), previous:(*errors.Err)(0x4001492d70), file:"github.com/juju/juju/state/state.go", line:247} ()
18:58:58 ... error stack:
18:58:58 	github.com/juju/juju/state/model.go:870: model "b4e24c33-10f3-4dfd-8067-4896e5c3ed42" not found
18:58:58 	github.com/juju/juju/state/model.go:200: 
18:58:58 	github.com/juju/juju/state/state.go:247: 
18:58:58 
18:58:58 [LOG] 0:07.654 DEBUG juju.state closed state without error
18:58:58 [LOG] 0:07.655 DEBUG juju.rpc error closing codec: write tcp 127.0.0.1:37376->127.0.0.1:33746: write: broken pipe
18:58:58 [LOG] 0:07.657 DEBUG juju.state closed state without error
18:58:58 [LOG] 0:07.657 INFO juju.provider.dummy reset model
18:58:58 [LOG] 0:07.694 INFO juju.testing reset successfully reset admin password