Because the damage looks like thrips damage?
Thrips are VERY stealthy...They completely slipped my detection the first few times I saw damage like that on my plants....and then...I saw one. Once I spotted one, I started to see more of them. I haven't had leaf miner damage...yet...*knock on wood*...So maybe you're right. You asked for suggestions. I'm giving you mine as to what it might be...I think it might be thrips.