With this in mind, it's said in the tenebrous tunnels mission that the vanguard never knew that the black garden could be accessed via freehold station.
I get that this probably doesn't correlate but if the crucible Mao pantheon has been around for so long how did the vanguard not know how to get to the black garden? I highly doubt guardians had to fly to Mars and go through that big ass portal and walk to pantheon from there.
However this isn't out of the question seeing that for the undying mind strike we land where the heart was to start the strike, as well as starting in the garden for the final step of the NTTE quest line
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Transmat zones maybe? I'm actually not too sure on that one.