Same here. I have never unlocked the macbook successfully the 1st time around (for a good 10 years), I always get a "wrong password" and have to re-enter.
My initial guess is that the text edit control has "select all content" set initially, so when you enter the 1st character, it's selected, and when you enter the following characters they overwrite that, essentially chopping off the 1st letter of the password (which is then incorrect, obviously). Unbelievable that this was never fixed (especially with IT-managed laptops that lock themselves very quickly).
My initial guess is that the text edit control has "select all content" set initially, so when you enter the 1st character, it's selected, and when you enter the following characters they overwrite that, essentially chopping off the 1st letter of the password (which is then incorrect, obviously). Unbelievable that this was never fixed (especially with IT-managed laptops that lock themselves very quickly).