Just a side note, if you use EZReplayManager, it has a Monitor.cs as well, I renamed the scripts in EZReplayManager to resolve my issue.
You might want to mention that to the author of the EZReplayManager package. The Monitor class is in the .Net standard library so it is hard for me to do anything more to avoid these kinds of issues. The author of the EZReplayManager should be putting the package’s classes inside a namespace.