Leaves findLog allows floating trees

[joserobjr]

🐞 I found a bug

The leaves don't check the log is actually to the it, so once all their update_bits are changed the leaves will remain floating until one of the connected leaves receive a block update.

📸 Screenshots / Videos

▶ Steps to Reproduce

1. Run /gamerule randomTickSpeed 400 (the original is 3)
2. Grow a tree (the leaves needs to be natural)
3. Break all logs except one
4. Make sure you have leaves which are disconnected but near the log
5. Await a few minutes (or seconds if you increase the randomTick gamerule as in step 1)
6. Notice that none of the disconnected leaves are still there
7. Break the last log block
8. Notice that the leaves won't decay
9. Break a single leaves block
10. Notice that all leaves that were connected to the broken leaves block will start decaying

✔ Expected Behavior

Start decaying once it has no connected log block in a distance of 7 blocks using manhattan distance

❌ Actual Behavior

The decay process don't check connectivity (1.2.0.1-PN) and caches the connected state incorrectly due to the lack of connectivity check (1.2.0.2-PN-SNAPSHOT)

📋 Debug information

• PowerNukkit version: 1.2.0.2-PN-SNAPSHOT b5c65a9
• Debug link: https://hastebin.com/oxodunegir