Do MySQL (5.6) triggers support 4 byte emojis? I'm using MySQL 5.6.34 with the following settings:   

"character_set_client","utf8mb4"
"character_set_connection","utf8mb4"
"character_set_database","utf8mb4"
"character_set_filesystem","utf8mb4"
"character_set_results","utf8mb4"
"character_set_server","utf8mb4"
"character_set_system","utf8"
"collation_connection","utf8mb4_general_ci"
"collation_database","utf8mb4_unicode_ci"
"collation_server","utf8mb4_unicode_ci"


3 byte emojis seem to work correctly within a trigger but 4 byte do not. They just become a '?'. Is there a different setting that should be used or is this just not supported within a trigger?
As in the github issue was recommended to change the settings on the following:

connection_charset: utf8mb4
connection_collation: utf8mb4_unicode_ci
charset: utf8mb4
collation: utf8mb4_unicode_ci


I suppose you could change 

"collation_connection","utf8mb4_general_ci"


on

"collation_connection","utf8mb4_unicode_ci"