Message: Interface/AddOns/TrinketMenu/TrinketMenu.lua line 65:
attempt to call global 'GetAddOnMetadata' (a nil value)
Debug:
[string "=(tail call)"]: ?
[string "=(tail call)"]: ?
[string "=[C]"]: GetAddOnMetadata()
[string "@Interface/AddOns/TrinketMenu/TrinketMenu.lua"]:65: in main chunk

Message: [string "*TrinketMenu.xml:162_OnLoad"] line 1:
attempt to call field 'OnLoad' (a nil value)
Debug:
[string "=(tail call)"]: ?
[string "=(tail call)"]: ?
[string "=[C]"]: OnLoad()
[string "*TrinketMenu.xml:162_OnLoad"]:1:
[string "*TrinketMenu.xml:162_OnLoad"]:1

I solved this by changing TrinketMenu.lua line 64 (maybe not) to
TrinketMenu_Version = C_AddOns.GetAddOnMetadata("TrinketMenu", "Version")
Seems like Blizzard change the function name so this script didn't finish execution

Tbh i think i solved it that way as well, but usually i dont know if i am breaking something else as well with that. So its best if author does it himself.