Crafting certain white flowers yields light gray dye instead of white dye

The bug

Crafting certain flowers that are white yields light gray dye instead of white dye as expected. All flowers that are affected were introduced before 1.14. For example, take a white tulip and notice how it crafts into light gray dye. In contrast, the lily of the valley, which was introduced in 1.14, crafts into white dye as expected.

Affected flowers

1. White Tulip
2. Oxeye Daisy
3. Azure Bluet