It's a 6mm, about 50mm deep hole. It's just a few mm to where it should be. I just want to make sure that when I drill the new hole the drill bit doesn't move to the softer filler (since the concrete is very hard).
I would try the same as absurdbird. Even pine might do it but there are a few considerations hence 'probably' also.
A standard filler that handles deep filling and would be secure after a few days is Fibarex from Toupret.
@Airhead started
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It's a 6mm, about 50mm deep hole. It's just a few mm to where it should be. I just want to make sure that when I drill the new hole the drill bit doesn't move to the softer filler (since the concrete is very hard).