1.20.1 Custom block bug

There is a problem or bug in customblock, Its all working fine when i was at 1.19.4, After i update to 1.20.1 this was happen. If i placed a block above custom block, the custom blocks turn into noteblock as vanilla noteblock. https://media.giphy.com/media/UcFuiqTAyDj2lF2rnB/giphy.gif

• Server Version: org.bukkit.craftbukkit.v1_20_R1 (Paper)
• Plugin Version: 5.3.5
• Plugin Build: 64893d49
• Is Premium: No
• Is Dev Build: No
• Supported Version: Yes

MythicCrucible build i used

• Build 3745