I agree with this, I reported the problem just in case.
A lot of questions/reports are asked/made about mirc/msl because we have no way to know if the behavior is intended than to hear it from you (or others trusted source but ultimately you).
For example there could be a note in the help file about /comclose saying that we are allowed to comclose at anytime, but that depending on the object and how it is used, the result is undefined behavior or may result in a crash.
