I always recommend running an engine for at least 30sec, preferably longer, and also don't "blip" the throttle but hold the revs steady at around 2k rpm.
There are various reasons for this. There is a cranking fuelling mode which can be somewhat rich depending on temperature of the engine. There will then be an afterstart fuelling phase while any enrichment ramps off . The system will reach feedback conditions by maybe 45sec or so. Ideally you want to get through all this before shutting down.
Blipping the throttle adds accel enrichment and makes plug fouling much more likely when cold.
Some systems can be adaptive and "learns" stable values but it can take a short time for this to establish, either time or cycles. If you start and run an engine for a very short time, especially when just part warm, it can abort the adaptive stage and it can default to something which isn't appropriate especially for a subsequent cold start.
I've had this with my old Yaris if I moved it on the drive when part warm and it then didn't want to start the next morning.
Start foot off the throttle, allow to idle for at least 15sec, drive off gently or ease the revs up to 2k rpm and hold steady. Allow the engine to run for at least a minute if you can before stopping it if you're only running it briefly.
As said by others, holding the throttle wide open during cranking "usually " inhabits fuelling and allows you to clear wetted plugs.
