I guess that's the difference between "check while I type" (i.e., not what others have typed) and upon sending.
I have never seen anything to change the behavior you're describing. If it really bothers you, you probably need to switch to some third-party application.
On a Mac since 1984. Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.