Surprisingly worked for me, I usually don't get so lucky. For instance my Daniel Operator still doesn't progress past Level 1 smh even though there was a patch for it months ago
If XP is not applying to your selected Operator, you may need to re-complete the designated unlock challenge for that Operator. For Daniel, the challenge is 200 Marksman Rifle Kills. Give that a try, and let us know if it solves your issue!