Affects Version/s: 1.16.3
Fix Version/s: None
When a superflat world preset with a stronghold is entered in, Minecraft will save the preset, but without the stronghold.
How to reproduce:
Launch Minecraft, click "Singleplayer", click "Create World" and turn cheats on. Click "More World Options", click "World type - Default" click "Customize", and then click "Presets." Remove all text from the text box and enter
Click "Use Preset", click "Done", and click "Create New World".
The message "Could not find that structure nearby" will appear.