Disappearing Blocks

[gdude2002]

Here's an amusing one for you. I'm investigating this plugin as part of a new server that I'm building - intended to service (mostly vanilla) 1.12.2 clients. I set up the plugin (along with LuckPerms so users aren't opped - otherwise the demo map spams the chat), and noticed some pretty weird behaviour in the demo.

For clients with Forge installed: Everything works as expected. Aside from the spawn protection, which I assume is why the README states that users should be opped when testing the demo - everything seems to work just fine.

For vanilla clients - without Forge: When joining a game, users are kicked for flying. If the server is configured to allow flight, users are unable to right-click blocks. The blocks disappear instead. The server does not appear to validate their movement either - they are free to move through any blocks they've vanished, although the server will register that they're inside the block and apply damage accordingly.

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Server info

Sponge: SpongeForge 1.12.2-2825-7.1.6 (current recommended build)
Forge: 2825 (as recommended for this SpongeForge build)
SurvivalGames: 1.2.0 (from Ore)

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Any ideas?