Thanks for your bug report. mIRC currently handles seven different formats for numeric 338. These formats have appeared in different ircds over the last 25 years.
Can you please type "/debug @debug" in your status window, perform the whois, and then post the results you see in the @debug window here for the numeric you think is causing the issue?
Update: Looking at the github comment, I can see why mIRC might not handle the third format being used by InspIRCd. I have changed the 338 code for the third format to be a little less strict. That said, it would still be useful to see your @debug results so I can see the numeric format.
Last edited by Khaled; 05/06/23 08:27 PM.