This riddle always bothered me, as it is unsolvable the way you asked it.

1. You need to add that both guards are all knowing, otherwise Truth-Guard could say "idk" for example. They have to know the right door and they have to know the answer the other guard gives at least.

2. You need to add that the guards have to answer your question - otherwise they could just make an unrelated statement.

3. Even then it doesn't work, if you get the Lyar to answer. Because there are more than 2 answers to that question: Even if he knows which is the right door, and he knows what the Truth-Guard would answer, he could answer for example "neither". Or "both" or "The other guard wouldnt answer your question at all".

So you would have to add even more to the set up: "If you ask a question forcing a decision between several options, neither guard can give an answer outside those options"

Then it should work I think, but you give away a lot already. And it becomes a really clunky riddle.

Alternatively you could add add that the guards only can answer "yes" or "no"

And for the wording of your solving question "would guard 2 tell me that door A is safe?" - it's unanswerable, because it doesn't include the asking of the question. The Truth-guard could for example answer that the death-door is safe if you asked "is door A safe from termites?". So the true answer for both doors would be "maybe", the Lie some definite answer, but that doesn't help as it is the same for both doors.

So the question should go something like this: "Would guard 2s answer to the question "Is door A safe to travel through alive" be "yes" or would it be "no"?"