Redirecting both stdout + stderror for Base.run results in an empty output when running multiple commands in sequence

[cdsthreeline]

Trying to run two commands in sequence, with redirected stdout + stderr using Base.pipeline, results in the second command's output being empty on MacOS 12.5.1 on a 2021 M1 Macbook Pro. This is an issue arises when using the M1-native version of Julia 1.8.1

MWE using 1.8.1, aarch64:

julia> module A 
       function f(command)
       stdout = IOBuffer()
       stderr = IOBuffer()
       
       run(pipeline(command; stdout, stderr))
       
       return String(take!(stdout))
       end
       
       function g()
       result1 = f(`echo 123`)
       result2 = f(`echo 456`)
       return result1, result2
       end
       end
Main.A

julia> A.g()
("123\n", "")

Curiously, only redirecting stdout seems to be fine

julia> module A 
       function f(command)
       stdout = IOBuffer()
       stderr = IOBuffer()
       
       run(pipeline(command; stdout, stderr))
       
       return String(take!(stdout))
       end
       
       function g()
       result1 = f(`echo 123`)
       result2 = f(`echo 456`)
       return result1, result2
       end
       end
Main.A

julia> A.g()
("123\n", "456\n")

Running on 1.8.1, x86-64 results in the correct output

julia> module A 
       function f(command)
       stdout = IOBuffer()
       stderr = IOBuffer()
       
       run(pipeline(command; stdout, stderr))
       
       return String(take!(stdout))
       end
       
       function g()
       result1 = f(`echo 123`)
       result2 = f(`echo 456`)
       return result1, result2
       end
       end
Main.A

julia> A.g()
("123\n", "456\n")

[vtjnash]

Redirecting to IOBuffer is supposed to destroy the contents at the end in all cases, not just with multiple streams redirecting to it. Use a Base.PipeEndpoint() to cause them to be the same IO kernel object.