Infection risk with continuous glucose monitors and sensor covers/patches?

Hello! This is more of a general curiosity question. I started using a Libre freestyle 3 cgm recently.

I noticed the hole in the middle of the sensor where the needle drives the probe into the skin does not have any sort of barrier to provide water resistance. It seems like it would be pretty easy for water, dirt, soap/ body wash, etc, to get packed into that little hole and bump right up against the area where the sensor is breaking through the skin.

Does anyone know how they mitigate infection risk with this, or why that's better than having something like a rubber stopper in there that seals back up when the needle withdraws?

Also, does this make those types of patches that seal over the CGM a bad idea? I mean, they are all listed as being breathable, but wouldn't that create additional risk from things like soapy water being trapped in the hole with a debatably breathable cover over it that likely ends up with dirt and grime on it to potentially further fall into the hole over a week or two?

Please note, I'm not trying to challenge anyone here or doubt the safety and effectiveness of the sensors themselves, I'm just really curious how they managed to go two weeks at a time without any significant infection risk and how those covers don't increase risk.

Thanks for listening and thank you for any insights or knowledge you can impart on me about this!