Fortune bug with crop harvesting (1.11.2)

[throwaway]

I noticed  today (using 1.11.2-forge1.11.2-13.20.0.2235 with Journeymap 1.11.2-5.4.6) that fortune enchantments do not seem to increase carrot/potato drops. It doesn't seem to be a bug related to Journeymap - the bug persisted after re-installing minecraft and only the forge (1.11.2-13.20.0.2315) with no other mods.

 

- Unmodded vanilla isn't affected - using fortune 3 pickaxe yielded ~4.5 carrots per block, compared to ~2.7 with no fortune enchantments

- I couldn't notice any increase with the drops while testing with forge, suggesting it's forge-related bug

- Fortune enchantment seem to work with other blocks, such as diamonds/redstone/gravel (even without using primary tools to break the block)

- I haven't noticed bugs with any other enchantments (such as silk-touch)

 

Relevant(?) System Info:

Spoiler

 

Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M

 

FML logs: https://pastebin.com/8ktCA9MN