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That's different because in Bitcoin's case there was a clear violation of the specification, of how it supposed to work. So the bug was fixed to make the software working as it intended to be. If there were two node implementations then one would just stop to work until fixed.

In Ethereum's case there were no violation of any specification. In fact there were no bug in the blockchain itself. Just someone took founder's money, they didn't like it and so they decided to get them back. And note that after that, there were bugs in the nodes code that were breaking the spec (which you should compare to the bitcoin's bug), but because of multiple node implementations only some of the nodes stopped and so we don't care about those issues.