Breaking two-block plants shows wrong breaking particles

Destroying the bottom block of a two-block plant will produce normal particles, but the top's are not calculated correctly. This includes ignoring grass.png data and the flower texture and just producing green particles.

For plants that were placed by the world generation peony particles are created, for plants that you placed sunflower particles are created.

Code analysis: https://bugs.mojang.com/browse/MC-29590?focusedCommentId=285174&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-285174