This is still an experimental phase for the WorldGuard hook.
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Fix ⍟ - This update is stable with build #1756 of WorldGuard 7.0 Legacy. The API of WorldGuard is currently under heavy changes to the point where there is no way around using reflection to have both WG 7.0 and 6.2.2. I have dropped 6.2.2 support from this point on until further research is done since this type of change would heavily impact the performance of the plugin.