Summary:
You can't plant bamboo on suspicious gravel. This is unexpected, because bamboo can be placed on gravel. Also parity with Java (MC-261171).

Steps to reproduce:

1. Place Suspicious Gravel.
2. Try to place bamboo.

Observed results:
You can't place bamboo on Suspicious Gravel.

Expected results:
You can place bamboo on Suspicious Gravel.