Collapsible javascript event attach multiple times

Simple workaround attached

I have created an MR to propose an alternative solution.

On my site I have a similar problem, I have a view that when I click to display an element it opens and closes several times. Checking, notice that the click event is added many times for each element. I think it could be solved using the core/once library of the drupal core to avoid the click event being added multiple times.
Maybe something like this can fix it:

once('views_tree_collapsible', 'html', context).forEach(function (element) {

The MR looks like the right approach to me.