<p>The study of coupled networks with parametric amplification of vacuum fluctuations has garnered increasing interest due to its intricate physics and potential applications. In these systems, parametric interactions lead to beam-splitter coupling and two-mode squeezing, creating quadrature-dependent dynamics. These systems can be modelled as bosonic networks, arrays or lattices, exhibiting exotic effects such as unidirectional amplification and non-Hermitian chiral transport that influence multimode squeezing. However, exploring and controlling these network dynamics experimentally in all-optical systems remains challenging. Recent advances in integrated nonlinear microresonators, known as Kerr microcombs, have enabled the generation and control of broadband high-repetition pulses on microchips. Kerr microcombs exhibit intriguing nonlinear dynamics where coherent photons occupy discrete spectral lines, leading to multimode squeezed vacuum states. Here we explore the lattice dynamics of vacuum fluctuations driven by dissipative Kerr microcombs. We design a photonic chip on which a spontaneously emergent pair of pulses creates extended multimode states of parametrically amplified vacuum fluctuations. These states exhibit oscillatory dynamics, with implications for squeezing and secondary comb formation. By employing integrated micro-heaters, we tune the vacuum fluctuations to eliminate the oscillations, establishing a fundamental connection between non-Hermitian lattice symmetries and Kerr combs, and paving the way for exotic quadrature-dependent optical networks with broad implications for quantum and classical photonic technologies.</p>