When generating a TARDIS (for example, the one from 2012-2017) it does not load well both its interior and its exterior and the default is set
The game still recognizes it as that TARDIS (I mean it still believes it's the one from 2012-2017)
but it really isn't and apart from that it doesn't allow redecorating the TARDIS, it just "redecorates" but it just goes into a loop where it doesn't let me enter the TARDIS