RegisterMapEvent Issue

[28269890]

When using RegisterMapEvent to register a dungeon, an error occurs: Error while decoding instance data: Data is not valid base-64

RegisterMapEvent(600, 4, function(event, instance_data, map, diff) end)

local event1 = function(event, instance_data, map, diff) end;RegisterMapEvent(600, 4, event1)

All types of events cause this error.

Symptom
All boss scripts in the registered dungeon become non-functional. Bosses can only perform normal auto-attacks (no special skills or abilities).

[kissingers]

https://www.azerothcore.org/eluna/Global/RegisterMapEvent.html
INSTANCE_EVENT_ON_PLAYER_ENTER = 4, // (event, instance_data, map, player)
no diff ?

not valid base-64 might not support the function or not support this event or no this map

[mostlynick3]

The reported symptom is actually not a symptom of this error but is a product of OnBeforeCreateInstanceScript in the core unloading its own AI and scripts if any other AI is loaded. So while the Base64 error exists, it doesn't cause the issue observed