Exported var Arrays in one object are connected/identical when initialized

[Reneator]

Godot version

3.5.rc6 official

System information

Windows 10

Issue description

When defining a Reference/Node with multiple "export (Array)" vars it seems that its either the same Array gets set in all the exports or they are linked with each other, because when you just go and append to one of the arrays that get exported, suddenly all the arrays receive the value[s]. I can circumvent this by setting the array instead, but this seems like unintended behaviour.

Steps to reproduce

Open the Reproduction project and press Run and check the console output.

Minimal reproduction project

Array_Reproduction_Test.zip

[Calinou]

Duplicate of #20436.