Q: I planted the seed, why am I not getting a tree?
A: There is a queue of trees to grow. You can see it via the /treez command

---===---
Here is a book of tree patterns
---===--
Q: Why can't I force place over seeds?
A: When you use Shift + Click (force-build) to place an entity on a tile that has a waiting seed marker — the small sprite showing a seed queued for growth — the build is blocked with an "entity in the way" message instead of automatically removing the seed.

Why this happens: the deconstruction planner needs the player-creation flag to select entities, and restoring that flag in v1.16.11 is what re-enables it. The trade-off is that Factorio's force-build logic also uses that same flag to decide whether to cancel an entity or block on it — and it blocks on player-creation entities rather than clearing them automatically.
Workaround: super force-build

Use Ctrl + Shift + Click instead. This is Factorio's super force-build, which overrides even player-created entities.