No coin is immune to this.

What, you thought other coins had their own code? Nope, they are all just a copy/paste of Bitcoin's code.

Specifically Dogecoin was "coded" (copy/pasted) in a Friday night, according to it's founder. So I don't know what you were expecting.

Just curiosity. I thought they copied the code from Litecoin and I was not sure if in any of the intermediate steps someone decided to fix this.

It will be interesting to see how each developer set and community handle this problem (and the future problems).

Disclaimer: I don’t own BTC or DOGE (or LTC or any other virtual currency).

There isn't really any development team comparable to that of Bitcoin in a different coin. Things that get fixed in Bitcoin are not fixed in other coins. But if another coin happens to fix something, it will be fixed in Bitcoin too.

Typically a copycoin will only have the same fixes as Bitcoin depending on when they decided to copy it. But then they will invariably lag behind.

It is quite short sighted to think that all digital currencies are "forked" from bitcoin: see http://www.openudc.org/ for instance:

"The OpenUDC softwares are designed to manage a free money system as described by the TRM (Théorie Relative de la Monnaie), that means a money system where no human has privileges in front of money creation either in time or in space."

The concept is therefore quite different from BTC which clearly gives some people a huge privilege in front of money creation in time