Right-clicking an advanced slab/block would cause it to revert back to normal with doubled drop

[Neubulae]

What steps will reproduce the problem?

1. Right-click a block to convert it to an advanced slab/block.
2. Right-click it again to convert it back to normal.
3. Voila! Double drop!

What were you expecting to happen? What happened instead?

I expected only one block drop.

What version of the plugin are you using? Type /version <Plugin Name>

1.10.0-SNAPSHOT

What Spigot version are you using? Type /version

Paper build #175

What plugins ae you using? Type /plugins

No other plugins are used. Only AdvancedSlabs

Do you have an error log? Use pastebin.com. If you're not sure, upload your whole server log

No.

Did your client crash? Upload errors in .minecraft/logs/latest.log as well

Neither.

Additional information? (Are you using Bungeecord? Did it work in previous versions? etc.)

There are no previous versions for 1.14 right?

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