Some blocks slow down minecarts travelling around a corner
The bug
When a minecart goes around a corner with a block in the corner it slows down. How much it slows down depends on what block it is. Hoppers slow down the minecart by a lot, while fences don't slow it down as much.
Affected blocks
Here is a (selection of) affected blocks. The amount of slowdown does appear to be somewhat related to the hitbox, but there are some inconsistencies.
| Large Slowdown | Medium Slowdown | Small Slowdown | No Slowdown |
|---|---|---|---|
| Hopper | Lectern | End rod | Air |
| Cauldron | Sea pickles (3) | Fence | Full blocks |
| Anvil | Grindstone | Closed fence gate | Slabs |
| Composter | Chest | Opened fence gate | |
| Wall | Candles (1 or 2) | ||
| Candles (3 or 4) | Some blockstates of stairs | ||
| Sea pickles (1, 2, or 4) | |||
| Some blockstates of stairs |