Confluence Quick-Search Auto-complete Only Loads When Searching Content in Clustered Environment

Using the Search Box in the top right. It should "live search" and suggest items as the user types. However, this does not happen and the user just gets the spinning circle. In example:

When selecting the live search he will show some of the recent results:

However if you type something to actually use the search it will spins forever, (yup, it's reproducible):

We also found out that after you go to the search page from quick search and try to search another word (different from what you searched in the quick search bar) and hit enter nothing will happen, you will notice in below screenshot that the word "teste" was written up, but in the URL the String reaming as tes (the word I searched previously in quick search).

You can also observe the behaviour in the below gif: