Improve session handling for TaxonNavigator and newTaxonNodeWizard
related to #5607.
It looks like the reason is that the assistant is using the navigator session and the navigator still has the old state. This can also be observed when changing a name slightly (e.g. adding a letter). The navigator only updates the name in certain cases, e.g. when creating a new taxon after clicking "OK".
We either need to improve navigator refresh or detach the assistant session from the navigator session.