Caught red handed: https://youtu.be/j1rt3YhfFHM
Save file/logs attached. Cannot correlate with other causal variables. Latest testing build as of posting date.
Upon reload, problematic tiles revert to normal, functional state. Then, after seemingly identical duration of time elapses, identical problem occurs (same tiles, same time in cycle).
Let me know if I can provide anything else to help out...