Player Scaling puts a Harmony prefix on ValuableDirector.SetupHost, which is a coroutine. Under BepInEx's HarmonyX the prefix injects into the state machine's MoveNext, so it fires once per valuable spawned instead of once per level. That's dozens of times, each logging a batch of "replace a curve" lines. With Size Matters active the volume is enough to stall BepInEx's synchronous logger, which reads as a freeze. Two fixes: a run-once guard so the curve rebuild happens a single time per level, and a reset of the static curve arrays between levels so they don't carry over. Nothing about how the game plays changes.