If a pot is placed under a stair block and a sapling is placed in the pot, it is in the pot but the sapling is invisible until broken (pot is visible), which drops the pot and sapling.
Another bug. If a pot is placed and a sapling placed in it, the sapling is invisible until you place another pot.
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki