Do MySQL (5.6) triggers support 4 byte emojis?
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"