LogFAQs > #977600054

watch through the credits for season 1 finale, there's a scene after. There are postcredit scenes here and there in other seasons but I forget when so also worth checking.

Also hope you're doing the sub because while people noted the series is over, the dub for the final "episode"/movie won't be out for a while. There was a 6 month gap before the dub for the second-last episode was released which would put the last episode dub release at May 2024 if same timeline, so, yeah...