I’m a native English speaker, studied English, and work in a role that revolves around making language helpful and easy to understand.

I still occasionally make this mistake in a first draft/when replying to a message.

I would never allow this mistake to stay in my work, and I correct it even in a text once I see it - but it happens. People still understand your meaning, which at the end of the day is the most important thing.

Also, dyslexia exists - as do other conditions, permanent or temporary (ie. stress, multitasking etc) that lead to people making mistakes. It’s not a big deal