The "clickEvent" option of "/tellraw" components only allows for single strings instead of json compounds as its "value". This is unexpected because both the "/tellraw" command itself and the thematically similar and structurally identical "hoverEvent" component both do support json compounds alongside singular strings.
Thus, not only can't simple strings be combined for a "clickEvent", but also scores from scoreboards, translation keys, entity selector and nbt data from for example storages (see the examples below) cannot be employed.
Setup:
/data modify storage example message set value 'Hello World!'
/tellraw:
# Singular String works:
/tellraw @p "Message!"
# Compound works:
/tellraw @p ["Message: ",{"nbt":"message","storage":"example","interpret":false}]
/tellraw hoverEvent:
# Singular String works:
/tellraw @p {"text":"Hover here","hoverEvent":{"action":"show_text","value":"Message!"}}
# Compound works:
/tellraw @p {"text":"Hover here","hoverEvent":{"action":"show_text","value":["Message: ",{"nbt":"message","storage":"example","interpret":false}]}}
/tellraw clickEvent:
# Singular String works:
/tellraw @p {"text":"Click here","clickEvent":{"action":"suggest_command","value":"Message!"}}
# Compound doesn't work:
/tellraw @p {"text":"Click here","clickEvent":{"action":"suggest_command","value":["Message: ",{"nbt":"message","storage":"example","interpret":false}]}}
The latter command results in the following error message:
Invalid chat component: Not a string: [...]
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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