What code is responsible for adding
- in front of taxonomy term sublevels on a taxonomy field in a node edit form?
Even though the most non-intrusive way to override it is preferred, I'm comfortable even with core patches.
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Looks like there is no easy way to override them, they are added by
$options[$vocabulary->id()][$term->id()] = str_repeat('-', $term->depth) . Html::escape($this->entityRepository->getTranslationFromContext($term)->label());
If you decide to edit it, I suggest using a Composer patch system afterwards if you are using Composer.