We're aware of an issue causing houses not to decay. We're looking into it and hope to have a fix in the coming days. We will do our best to avoid refreshing all houses in order to avoid inconveniencing players watching the houses any further. The goal is, once we have identified the root cause and come up with a solution, we will start the current stage timers over again, meaning IDOCs would be continue to be IDOC until they collapse after 1-3 days as expected normally. More details will follow when we know more

UPDATE: We have identified the issue and deployed a fix. After the daily restart at Jan 13, 9am UTC, any houses that might be IDOC currently will have their times reset but will remain as IDOC, and then they will collapse within the normal IDOC timeframe after that. We have also extended the decay time for objects that fall to the ground from a collapsed house. Thanks for your patience and sorry for the inconvenience!