Ok, I found what’s going on with twtxt.net. If I use the upper Textbox it works (it’s inserting there the Twt code, like #45lcr2a, and the user.
In the lower Textbox inside a Thread, it’s not inserting it
Actually, I think you just found a bug. I am bringing this to @prologic’s attention. If you are in a yarn, and click/tap the reply icon/link, it doesn’t mention the nick. It should.