There's a delay between when you get off the toilet and when it flushes automatically (about 10 seconds, on some models it is configurable), so there is enough time to close the lid first. You can also turn off the feature completely, but personally I'd much rather have the toilet get flushed with the lid up than not at all (because someone forgot, made a mistake, etc).

Also, the science doesn't really back up the claim that closing the lid prior to flushing makes a meaningful difference [1]. Cleaning the bathroom and toilet regularly has a much larger impact than whether or not you close the lid before flushing.

[1] https://www.ajicjournal.org/article/S0196-6553(23)00820-9/fu...