Thanks.
Okay, I just remembered that there was already a custom code implemented for a request you had before, I believe it was something to do with events that start before/after a specific timeframe around a date, when the page is first loaded.
I added a small bypass there, to not activate that code on this specific search instance. I am not sure if the results are as expected, but I am seeing results after the given date now as defined in the filter.