I wanted to submit a bug, but it directed me here...
In this case I'm using it for personal stuff, not work, but the bug would affect anyone, so here goes...
I logged into the new Trello today to use my board for package tracking. Whenever I try to add a package to be tracked, it is randomly inserting a tracking number into the field and I have to replace it with the number I want to be in there. This wasn't immediately obvious to me. I haven't used I haven't done this in weeks/months so I don't know where the number it is inserting is coming from.
When you try to select the number to remove it and copy/paste a new one in, your selection isn't highlighted. When I put my cursor in to delete it with the Delete key, nothing happens. However, when I just put my cursor there and pressed CTRL-V, it was replaced. Before I realized it was a random number and not from the link I'd put in the card's Description/Note field that is automatically there I thought it was broken because the Track button is grayed out. I was trying to enter a package from FedEx and the number it added is UPS. After several attempts it finally clicked in my brain that it was a number starting in 1Z which means UPS. Track was grayed out because there was a UPS number with FedEx set as the carrier. I have some 13+ packages coming due to a bathroom remodel and just other just daily life stuff coming that was split into multiple shipments, so having this feature work properly would be great.