Large ferns and tall grass (the two-block-tall variants) do not drop themselves as items when mined with any tool, instead dropping either nothing or their one-block-tall variants. Because of this, prior to 1.14, the item forms of these two-block-tall plants were exclusive to creative mode. In 1.14, the large fern item was added to taiga village chests and the tall grass item was added to savanna village chests. It seems likely that this change was made without recognizing that the items were unobtainable in survival, and that the single-block-tall plants might have been used otherwise. It is inconsistent with the rest of the game, where no other item is renewable in block form but both obtainable and non-renewable in item form.

What I expected to happen was...:
Not to find an item which can only be obtained in item form from village chests.

What actually happened was...:
I found an item which can only be obtained in item form from village chests.

Steps to Reproduce:
1. Open chests in savanna or taiga villages.
2. Find a large fern or tall grass block.