What’s this? Pls🙏

I gather your in soil Your roots finding it hard to breath. Lowering nutrient uptake and N is the most easily absorbed nutrient. So, when she did catch her breath. I take it the feed(s) you've been giving has caught up. If its coco. You need to feed water at least every 2nd day for its that feed. Or do small feed in day, and same amount of water at night to break down any left over feed. Good luck

Thats heavily too much nitrogen in last feed/feeds. If coco - reduce amounts If soil - plain water for 2-3 waterings. All should be good.

My guess is that root is stuck at area where salt buildup is happening, if it's correct it's best to flash the substrate with pH controlled water and check the EC of runoff, be ready for that process, you can even use some nutrients but at low dosage as flash Good Luck 😎

Bleaching from too much light. That's my guess. OR, since i do see it on some lower down leaves, and i do see some signs of nutrient stress, it could be early sign of nutrient burn. But my first guess is still light bleaching cuz i'd had that happens and it looks just like that on the tips of the leaves. Especially mostly affected at the top of the plant.