For its entire history as a plugin, TFGuilds has been problematic. In its early days, it used to lag the server every time someone sent a message because its MySQL implementation had optimization on par with Yandere Simulator. Nowadays it isn't that bad, but the awkward design and horrifically broken implementation is still there.
We have been having problems with TFGuilds for an entire year now, with bugs being discovered left right and center. Every time we think we have fixed it, we get 10x more bugs coming our way. We could obviously try to fix the plugin, but with how many bugs there are, I think at this point the plugin is a lost cause.
In the wise words of my assistant:
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I say we should remove the plugin and migrate the data it used to have to another more well-made plugin.