Random Relevance Sorting - Randomize with every Search or Session

Hello! I ad a question regarding random relevance sorting - once the random relevance has been added in the Search backend configuration, is the expected behavior that the results will randomize with every search or with every session (i.e. results will randomize on the first load of the session, but the same randomized order will be maintained for the searches within the same session)?

I assumed that the expected behavior would be the former, but I’m seeing that in one session, the results are not constantly randomizing with each search.

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