I have two middle names, and it amazes me how many digital systems cannot handle this in 2025. I have yet to find a bank that supports spaces in your middle name, and multiple airlines have decided to just concatenate my middle names together.
Second, this was before the government (and businesses) were so picky about everything matching perfectly, and you could get away with mismatches more frequently because you had more human eyes looking at things. Those humans would easily realize that when the customer they've known for years as "Jane Smith" shows up with a birth certificate reading "Jayne Smith," it's the same person.
It gets me hassled every time a cop looks at it.