As several people ( thanks Jay) have commented it appears that after playing the removed interactive scenes in GTA: SA you re-appear stuck in an invisible box.
Unfortauntly this is a problem with playing removed and possibly unfinished sections of the game, so far the only way out is to kill yourself (satchel or grenade could be good choices here), DO NOT jump, you’ll be stuck and forced to reload your last save.
If a method of escaping this box that doesn’t involve dying is found I’ll be sure to post it here.
Don’t forget that GTA: Censor Remover can re-enable the censor (disabling the extra scenes) if you decide that you no longer wish to have access to this hidden functuality