Twitter now allows you to compose entire threads at once, at least in the mobile browser interface. That’s how I did my thread just now. Not sure if it shows up any differently. Looked like it was spacing tweets 2s apart.
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It’s a good feature. But seems to have problems. I had one in my drafts (it was a big thread, with images in each post) and the draft somehow separated where two of the tweets from the middle suddenly appeared as their own draft thread, unconnected.

