Grass will not grow under a fence or cobblestone wall.
Steps to reproduce:
1) Make a dirt rectangle surrounded by grass blocks
2) Places fences or cobblestone walls around the rectangle
3) Wait to see if the grass will grow under the fence or cobblestone wall square dirt area.
This makes fenced sheep farms extremely difficult. Affects versions at least since 0.9.x.
Linked issues
is duplicated by 1
relates to 4
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Just to add, grass also does not grow under upside down stairs or stone walls
Appears to still not work on 0.11
I'm surprised to see this listed as RESOLVED and pointing to a general problem with grass growing on 0.11.x. This (grass not spreading under fences) issue has existed since 0.9.x....

Plethora, if grass cannot spread at all in the recent builds, then there is no way to test if this is still an issue.

Hands down one of my most hated bugs in the game. Happens for me aswell still. 0.15.0 iPad Pro 12.9"
This bug was submitted for a test and will be fixed in future updates.
Reconfirmed on Samsung Galaxy S6 (SM-G920W8), Android 6.0.1 MCPE 0.15.90.2

Fixed in 0.16.0 beta build 4 AKA 0.15.90.7.
NOT FIXED ON XBOX RN 1.16.?
Reproduced in creative and survival on Galaxy S4, Android 4.4.2 by enclosing a dirt area with fence on dirt with grass blocks surrounding the outside of the fencing. To be clearer, if there is a grass block under any part of the fencing, grass blocks will grow into the fenced in dirt area.