Moon randomseed function only within a body (do)

Question

I’ve been programming Lua for a long time, but I’ve almost never had to work with math.randomseed, I searched and found nothing informing about it, did some testing and none worked as I expected. The function math.randomseed changes the value of the math.random, but needed this Seed to be altered only inside a body do and as I came out of it back to its previous value, I know the pattern is os.time(), but in the code the Seed can be changed to any other.

Example:

math.randomseed(10) --> não tenho acesso a essa parte do código
do --> parte do código que tenho acesso
    math.randomseed(50)
    ...
end --> até aqui a seed teria q ser 50
--> aqui a seed teria que voltar a ser 10

I made a code:

math.oldrandomseed = math.randomseed
math.randomseed = function(seed)
    math.seed = seed
    math.oldrandomseed(seed)
end

so you would know what the previous issue was, but you would have to have access to the outside of the code in order to execute it at the beginning (outside the do), The point is, there’s some way to do this without leaving the do?