What was expected to happen ?

door get replaced with a door block with different open attribute

What happened instead ?

nothing happened 

Here is my command i used to run the setblock command using exeute

/execute if block 100000 2 100032 minecraft:dark_oak_door[open=true] run setblock 100000 2 100032 minecraft:dark_oak_door[open=false] replace

actually , the execute command itself is unrelated to this issue , it is the setblock command itself that does not work if there is already a door in the position regardless open attribute

/setblock 100000 2 100032 minecraft:dark_oak_door[open=false] replace

Workaround to fix this issue :

set the block to air first then place the door