The two major fixes in this group are for more cases that stopped working with those additional checks in the code. We actually have two more cases that we knew were broken and wanted to make one large progress report entry with them all, but sometimes the timing doesn't work out. This didn't matter because the EFB Copy is huge, and most of it is transparent, so users never noticed. Using last month's example, Donkey Kong Country Returns, everything rendered perfectly in Store EFB Copies to Texture, but, in reality, EFB Copies to Texture was actually rendering Donkey Kong one pixel too big. It turned out that Store EFB Copies to Texture was working in a lot of cases that it really shouldn't, and with the added checks and restrictions put in, those cases were made much more obviously broken, mostly dealing with partial updates to EFB copies.
All of these fixes are for 'regressions' from various cleanups to the EFB Copies code. Much like last month, the partial update changes do not fix something that didn't work in Dolphin at some point in the past.