Bug
Dragon's Breath at the "bedrock fountain" can be bottled for longer than expected. It can be bottled for as long as the entity persists, even when the breath visually disappears.

Expected Result
When bottling, once the size of the hitbox is reduced to zero, the entity will no longer be able to be bottled and/or the entity will disappear.

Observed Result
Once the size of the hitbox is reduced to zero, it can still be bottled until the entity de-spawns, meaning it can be bottled for far longer then expected.

Attached is a video demonstrating the bug in a vanilla world.

Note - The breath from the purple fireballs she shoots appear to work as intended.