How to reproduce the issue:
Set the game rule `randomTickSpeed` to a high value (for example, 100).
Plant a block of sugar cane.
Use the F3 debug screen to examine the block state of the newly planted sugar cane. It will continue to display `age: 0` until the block is updated or the chunk is reloaded. Despite this, new sugar cane blocks will grow, which can only happen with `age: 15`.
Environment
Java 1.8.0_25, 64-bit, under Windows 10 build 16299
WAI per MC-77170.