As others have said, it's frustrating not being able to move a task from a task list in one project to a task list in a different project, especially when it feels intuitive to be able to drag it to another list and when that list happens to be in a different project, the message 'The target list is in a different project' discreetly shows in the top right hand corner, whereas I'm looking on the left side of my 27" screen and wondering why it didn't do anything.

'OK,' I think, 'I'll just use the Move command instead'.... but then I encountered another UX issue: when you click on the 3dots for the task, the third command is Copy / Move. However, when you select it and pick the project you want it to move to from the drop down menu, I have multiple times then clicked the 'COPY' button instead of the Move button, and had to delete the original.
Why? Because the option in the Task menu is 'Copy / Move' but the buttons are ordered 'Move / Copy'! I have literally clicked on the 'Move' bit of the 'Copy/Move' option so my user brain, which is trying to move a bunch of tasks as quickly as possible, is primed to click on the right hand side!

Please fix!