I find that if you touch (with your finger, not the pencil) on the blue dotted underlined words (sometime several times), it will give the original intended version (e.g., with capital "L" in your example).
Another trick I've found is to start with only the capital capital letter, pause, and then finish the word:
“Don't forget to register for the L [pause] ecture S [pause] eries.” will yield “Don't forget to register for the Lecture Series.”
Apple support at this level is mostly bot scripts to check for the obvious and unfortunately delay addressing the real issue we all have to deal with.
After I reach my daily limit to tolerating Scribble, I fall back to disabling Scribble altogether and use the third party Handwriting Keyboard (https://apps.apple.com/us/app/handwriting-keyboard/id926102392)
For the ultimate handwriting experience, I find myself more frequently flipping over to my Samsung tablet with Google Keyboard handwriting that is unsurpassed.
I hope this helps (because Apple won't be getting back to us ;-)