The Worst New Macmillan Tile
Due to the C shape, I dub it the Cancer Tile.
This is now easily the strongest tile in the game, possibly stronger than the Shack.
This is the worst long wall design possible, as there is no short side and it is an easy fast vault every time. A survivor could easily loop the C wall alone 3 times to waste a significant amount of the killer's time. This long wall is even stronger than the Shack's window because at least the killer can force the survivor to take the short side and make the fast vault more difficult whereas with this wall the fast vault is almost a given every time as good survivors always can rotate into the inside of the C. The wall by itself would make a very strong isolated feature on the map.
The pallet is almost oppressively safe. Again it features long walls of equal length so the survivor can easily and mindlessly loop the killer running around it and using a figure 8 pattern. It has high visibility so there are few mindgames. This pallet by itself would make a very strong isolated feature on the map.
The transition from the pallet to fast vault the window is so easy it's automatic. Followed up by an easy rotation back to the pallet. It's almost like 2 tiles rolled into one, it's that strong.
A good survivor will often loop a killer into bloodlust 2 on this tile before entity-blocking the window and even considering dropping the pallet, and more often than not they will exit the window left and easily make enough distance to get somewhere safe. Entity help you if another tile or pallet spawns on the other side of the C. The tile by itself is enough to make any M1 killer think twice about even bothering to try to catch a survivor there.
Unlike the Shack, this tile can generate multiple times on a map. I recently had a game on Shelter Woods with 3 of these tiles and I was up against a decent team of survivors. I got obliterated and they never even had to drop any of those 3 pallets or Shack pallet, they just chained them together.
You might argue that tiles similar to this have existed before in DbD and you'd be correct. But never are they this strong, and more importantly, this easy. They always had a short side to the walls around the window or pallet if not both and often made it hard (but not impossible) to get a fast vault on the window.
In summary, this tile is too strong and should not exist in DbD in it's current form. Turn the C into an L, make the pallet less and/or the fast vault on the window not as easy.

Comments
You probably want to change what you're calling it - cancer isn't taken lightly on this forum. But as for the design of the tile itself, hundred percent agree. That window placement is nasty and there's not really anything a killer can do there if the survivor has basic tile knowledge.
That makes no sense for a survivor to use skill and loop around that three times they should make the entity come out of the ground and trip up the survivor if they go within 16m of the tile to match the rest of the survivor treatment.