Dark Oak leaves started decaying when a Spruce mega tree was cut near it.

Steps to reproduce:
1.  Place Dark Oak and Spruce saplings in following manner.

2. Let them grow or bonemeal them.
3. Break all of the Spruce logs and watch the leaves decay.

Expected results:
Only Spruces leaves decay.

Observed results:
Some Dark Oak leaves decay as well.

The following is a video of this bug happening to me in Survival mode:

https://drive.google.com/file/d/1qlZScYJRkmDEkguxHwCMFySvOBqAIecc/view?usp=sharing

And here's the bug reproduced in Creative mode:

https://drive.google.com/file/d/1LzcnL7kpzQ_9GUb-6qIo_Uw_C7WxOuqm/view?usp=sharing 

Note: Might take a few tries before the bug is reproduces successfully.