Yes, but it doesn’t always happen. For example copyright (著作権, ちょさくけん) doesn’t do this. Or is this because it’s a combination of 著作 (ちょさく) and 権 (けん)?
作今 (さっこん) does adhere to the aforementioned rule.
Are vocabulary from compound vocabulary the only exception to this? I feel like we are only seeing the peak of the rule iceberg.