Multiverse/Multiverse-Core — comment on commit 29360feb4e6b678cb6a821c6a9de96f7049c9c0e
File:  line 0
By dumptruckman:

Actually, I'm fairly sure you can get resulting oddities even without a ConcurrentModificationException being thrown. I recall a bug I fixed in one of my plugins that was due to modifying a list in just such a way where no exception was thrown.