Of the 19 balls put in play against Montas, 4 had EVs over 100 and 5 and EVs over 95. That's quite a bit of loud contact. But the velocity was up over his previous starts. Could have been adrenaline, we shall see. He was a decent pitcher as recently as 2022 so maybe a tweak here or there and he gets you 5/6 innings and 2, 3 runs earned runs per start.
He had shoulder surgery in Feb of 2023. Maybe it's just taking him a while to get back to healthy.