So, does the current implementation of Core (<30) allow for an OP_RETURN of 100 bytes to make in in to a block? Are there currently 100 byte OP_RETURNS in the blockchain?

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Therefore it is the action of changing or removing the filter that allows the 100 byte OP_RETURN to make it in to a block? Which is what Core 30 will do?
I understand that. My point is that, as I understand (might be wrong), there should be no OP_RETURN data larger than 80 bytes in the blickchain currently. This would be due to the default setting in Core < 30. Again, I might be wrong. Trying to understand