I also have the issue. Not sure if it's the same bug or not, but when using a raw mesh instead of a mesh wrapped in a group, the click on "click twice" does toggle the cube off then on... but only once: https://stackblitz.com/edit/stackblitz-starters-bumhz6?file=src%2Fcomponents%2FTheExperience.vue. Same thing if I wrap everything within a <template>

Here's another pared down StackBlitz exhibiting the error. This time with 2 mesh setups, perhaps leading in a useful direction.

In the example:

• If the v-if is on a TresMesh that's a child of Scene, toggling off -> on causes the TresMesh to have a null parent.
• If the v-if is on a TresMesh that's a child of a Group, toggling off -> on works normally.

Expanding on the bug report from @Tinoooo , the problem appears to be elements – not just TresGroup – that are parented to the Scene and toggled with v-if. Here's the StackBlitz from @Tinoooo , but I've parented the v-if'd TresGroup to another TresGroup. It works as expected.