Stepper works only with fixed height

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<template>
  <MDBCard class="mx-2 px-2 mb-8">
    <MDBCardTitle class="mt-4 mx-4">
      <h1>Aktivitäten und Einschränkungen</h1>
    </MDBCardTitle>
    <MDBCardBody>
      <MDBStepper vertical ref="stepperRef">
        <MDBStepperStep v-for="(v,k) in whodas">
          <MDBStepperHead :icon="k.toString()">
            Frage {{ k }}: {{ v.s }}
          </MDBStepperHead>
          <MDBStepperContent>
            <MDBCard class="mb-3">
              <MDBCardImg :src="v.p" alt="..."/>
              <MDBCardBody>
                 <MDBCardTitle>{{v.t}}</MDBCardTitle>
              </MDBCardBody>
              <MDBCardFooter>
                <MDBRow>
                  <MDBCol class="d-flex justify-content-end">
                    <MDBBtn color="primary">Blabla</MDBBtn>
                  </MDBCol>
                </MDBRow>
              </MDBCardFooter>
            </MDBCard>
          </MDBStepperContent>
        </MDBStepperStep>
      </MDBStepper>
    </MDBCardBody>
    <MDBCardFooter>
      <MDBRow>
        <MDBCol class="d-flex justify-content-end">
          <MDBBtn color="primary">Weiter</MDBBtn>
        </MDBCol>
      </MDBRow>
    </MDBCardFooter>
  </MDBCard>
</template>

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<style>
#app {
  font-family: Roboto, Helvetica, Arial, sans-serif;
}
</style>

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<script>
    import {
        MDBStepper,
        MDBStepperStep,
        MDBStepperHead,
        MDBStepperContent,
        MDBCard, MDBCardBody,MDBCardTitle, MDBCardImg, MDBCardFooter,MDBBtn
    } from "mdb-vue-ui-kit";
import {
    ref
} from "vue"
export default {
    components: {
        MDBStepper,
        MDBStepperStep,
        MDBStepperHead,
        MDBStepperContent,
        MDBCard, MDBCardBody,MDBCardTitle, MDBCardImg, MDBCardFooter,MDBBtn
    },
​
  setup() {
    const stepperRef = ref(null)
    const whodas = ref({
            "1": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/200"
            },
            "2": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/500"
            },
            "3": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/400"
            },
                  "4": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/500"
            },
                  "5": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/600"
            },
                  "6": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/200"
            },
                  "7": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/100"
            },
                  "8": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/200/500"
            },
                  "9": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/300/600"
            },
                  "10": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/300/500"
            },
                  "11": {
                "s": "Item 1",
                "t": "Some random Text ...........................",
                "p": "https://picsum.photos/100/500"
            }
        })
    return {stepperRef, whodas}
  },
  
    props: {
        msg: String,
       
    }
}; 
</script>

Console errors: 0