Here are several videos showcasing it, but I could find none with steps to reproduce it 100%.
https://www.youtube.com/watch?v=cdUpjG2iqe4&feature=youtu.be
https://www.reddit.com/r/apexlegends/comments/ast91v/server_crashing_bug_with_havoc_patch/?st=jsdyyq3z&sh=65b21ad9 https://clips.twitch.tv/SavageSleepyDogeNomNomEdit: it appears to be after dropping the havoc in its already bugged state (no reserve ammo, cant reload) that actually crashes the server. I cant confirm this but hope it helps.
thank you!