For some reason, I can't commad Danse while in workshop mode anymore. I've tried restarting the game, taking him as a companion then sending him back, but the prompt is still gone. From what I could tell, it still works fine for everyone else in the settlement.

I possible cause for the bug is I proceeded with the Mass Fusion quest and became enemies with the Brotherhood. I completed the quest and went to Sanctuary to check up on Danse. Since I romanced him, he didn'tt attack me, but he refused to talk to me. So, I reloaded to before the "point of no return", where you relay to th Mass Fusion building and become enemies with the Brotherhood. He's speaking to me and I can take him as a companion, but that issue has cropped up (even though back when I lost him as a companion, I could still command him like a settler).

Anyone else encounter this bug?

That is not a bug, but deliberate. You can't take Danse anymore if you are enemies with the BoS.

But that's just it; I reloaded to before I became enemies with the Brotherhood and went off in did other things. Even then, before I reloaded, I went to Sanctuary and was still abke to tell him to go to different spots while in workshop mode.