I've noticed the following stacktrace. I'm not sure if this is new or not but here is the stacktrace along with the log lines around it. I modified the .cs file to add additional output before the OnEntitySpawned is called.

[event] assets/prefabs/npc/ch47/ch47scientists.entity.prefab
[InfoPanel] Entity: ch47marker[10750357]

[InfoPanel] Entity: ch47scientists.entity[10750356]

Failed to call hook 'OnEntitySpawned' on plugin 'InfoPanel v1.0.7' (KeyNotFoundException: The given key was not present
in the dictionary.)
  
  at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <fb001e01371b4adca20013e0ac763896>:0
                                                                               0b/s in, 0b/s out
  
  at Oxide.Plugins.InfoPanel.OnEntitySpawned (BaseEntity Entity) [0x00189] in <b2bb48832e2a40428cb4103f1bd8af62>:0
  
  at Oxide.Plugins.InfoPanel.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0063e] in<b2bb48832e2a40428cb4103f1bd8af62>:0
  
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <23ba99f131254889867c71f0bd137b1d>:0
  
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0
  
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <157a94ee66ab4a7991faecd

Calling 'OnEntitySpawned' on 'InfoPanel v1.0.7' took 243ms

This stacktrace appears to still exist in version 1.0.9:

[event] assets/prefabs/npc/ch47/ch47scientists.entity.prefab
Failed to call hook 'OnEntitySpawned' on plugin 'InfoPanel v1.0.9' (KeyNotFoundException: The given key 'ChinookEvent' was not present in the dictionary.)
  at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <47fc8c70fa834cbf8141d7c1a7589125>:0
  at Oxide.Plugins.InfoPanel.OnEntitySpawned (BaseEntity Entity) [0x00144] in <fccca5edcc364144abd5195e5b201c18>:0
  at Oxide.Plugins.InfoPanel.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0063e] in <fccca5edcc364144abd5195e5b201c18>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <e3740cd7ab6f40909737d74eeeaf1a8a>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <032ab7611607468ebf42c14e3cf9df20>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <032ab7611607468ebf42c14