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Nevermind I forgot that in a transition, 2 identicals name tags (here img) need a key attribute to be distinct.
Everything works better with this 2 lines:
<img v-if="!showMenu" src="../assets/icons/icons8-menu-50.png" alt="icon-menu" key="imgMenu"/>
<img v-else src="../assets/icons/icons8-delete-50.png" alt="icon-delete" key="imgDelete"/>
- [Vuejs]-Vuetify – getAttribute of data attribute in a component returns null
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Source:stackexchange.com