New bug on Paper 1.12.2

The bug is related to the fishing rod and the ender portal, when I throw the hook from the fishing rod into the ender portal, it gives this error to the console:

1.12.2 is entirely unsupported. Please update to 1.16.5 if you wish to receive support.

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This bug is also present in 1.16.5

please open an issue on github then, with a 1.16 log