snap calling other snap fails with userlookup

Xenial, running snapd 2.40

We have a snap installed in develop mode that call's juju, this call failes with the following errorstack:
     83559: .2 83559: s.so.2panic: user: lookup userid 1000: invalid argument

goroutine 1 [running]:
github.com/snapcore/snapd/client.storeAuthDataFilename(0x0, 0x0, 0x55c181ec6fbe, 0x55c18283fa00)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/client/login.go:99 +0x11a
github.com/snapcore/snapd/client.readAuthData(0x0, 0x0, 0x0)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/client/login.go:135 +0x3d
github.com/snapcore/snapd/client.(*Client).setAuthorization(0xc42013a700, 0xc420158900, 0xc42026f8d8, 0xc4200ba8a0)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/client/client.go:153 +0x36
github.com/snapcore/snapd/client.(*Client).raw(0xc42013a700, 0x55c18241eeb9, 0x3, 0x55c18242913a, 0xf, 0x0, 0x0, 0x0, 0x0, 0x70, ...)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/client/client.go:214 +0x391
github.com/snapcore/snapd/client.(*Client).do(0xc42013a700, 0x55c18241eeb9, 0x3, 0x55c18242913a, 0xf, 0x0, 0x0, 0x0, 0x0, 0x55c1827dcba0, ...)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/client/client.go:271 +0x11d
github.com/snapcore/snapd/client.(*Client).doSync(0xc42013a700, 0x55c18241eeb9, 0x3, 0x55c18242913a, 0xf, 0x0, 0x0, 0x0, 0x0, 0x55c1827979e0, ...)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/client/client.go:315 +0xd8
github.com/snapcore/snapd/client.(*Client).SysInfo(0xc42013a700, 0x1c, 0x0, 0x0)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/client/client.go:570 +0xa4
main.maybeWaitForSecurityProfileRegeneration(0xc42013a700, 0x0, 0xc4200d6500)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/cmd/snap/cmd_run.go:149 +0xff
main.(*cmdRun).Execute(0xc42026ff08, 0xc4200c6160, 0x2, 0x3, 0x0, 0x0)
main.(*cmdRun).Execute(0xc420243f08, 0xc42001e190, 0x2, 0x3, 0x0, 0x0)
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/cmd/snap/cmd_run.go:185 +0x175
main.main()
        /build/snapd-mCqUEj/snapd-2.41/_build/src/github.com/snapcore/snapd/cmd/snap/main.go:434 +0x527
Exception calling juju status command. Command '['/snap/bin/juju', 'status', '--format=yaml']' returned non-zero exit status 2

(The last line if from python)

Running juju by hand works okay, validated that the same executable is called.