Just wanting some advice as I had to flush today a...

Look lilke Nitrogen deficiency, next grow you can use veg nutrient a few weeks more so discololoration will start later.

Das ist kein Nährstoffmangel und auch keine Blockade. Amnesia Auto (wie fast alle Ruderaliskreuzungen) verbrauchen gegen Ende massiv die Nährstoffe in den Blättern, um die Blüten zu unterstützen. Also, in dieser Phase der Blüte ist es sogar wünschenswert wenn sich die Blätter so verfärben/vergilben, da die überschüssigen Nährstoffe abgebaut werden und der Rauch somit milder wird. Viel Glück!

They look beautiful, when they get late into flower they'll start consuming themselves. Totally normal. Best of luck 👍

Is the browning of the tips starting from the bottom of the plant? If so, it could be a calcium deficiency. You said you flushed, so I would go easy on the nutes at first, and just make sure you have enough calmag being offered to the plant. Are you using liquid nutes or organics? It's hard to lock out a plant when using organics, but if using liquid nutes, you mat have had a salt build up which will lock out the nutrients. Also make sure to watch your PH when feeding when using liquid nutes. Plants take up nutrients best in soil at a ph around 5-6