Discovered with my mod, reproduced with yours while reactor is active.

Chunks for a dimension will not unload properly when a chunk is being marked dirty from a reactor that is active.

Creates a chicken and egg problem because it appears that both of us rely on chunk unloading to stop ticking, and for a chunk to unload the reactors must stop marking the chunk dirty, so they need to stop ticking or be at inactive equilibrium.

Verified with ER/ZC 2.0.3

If you find a solution, please comment it here so that I can implement it as required to solve the problem for my mod.

Missed that there is a separate repo for ZC issues, this should probably have been opened there instead