I can confirm this behavior.

Found in net\minecraft\network\chat\Component.java

• "A score component needs a least a name and an objective"

• "Don't know how to turn " + jsonElement + " into a Component"

• "Unexpected empty array of components"

• "Don't know how to serialize " + componentContents + " as a Component"

Also these, but I don't know if they are sent to chat:

• "Couldn't get field 'pos' for JsonReader"

• "Couldn't get field 'lineStart' for JsonReader"

• "Couldn't read position of JsonReader"

Can confirm this on all Versions with Component System.

I assume that there's can be more hardcoded Translations, but there's two Commands to produce two hardcoded Error Messages.

/give @s apple[max_damage=999999999,max_stack_size=10]
/give @s apple[minecraft:custom_name="1"]

Update: the Particle String was found as

particle.invalidOptions

Outdated Version of this Comment:
Credits to @unknown.

I want to share this Error Message with y'all!
How to reproduce:
Try to use this Command:

/particle minecraft:dust{}

Still not fixed in 20w18a, 20w19ab, 20w20a and many other Versions...

It is possible that this Problem can be reported as other Bug, but there's untranslatable "<--[HERE]", even if command.context.here is translated.

/tellraw @s []

/tellraw @s [{"hoverEvent"}]

/tellraw @s [{"translate":"%s","with":"s"}]

/tellraw @s [{"translate":"%s","with":{"%s":"1"}}]

/tellraw @s [{"translate":"%d","with":[%d]}]

Hello!

I decided to research Source Code to find those Strings... and I found it!

In

net\minecraft\util\GsonHelper.java

These Strings were found (1.21-pre1):

throw new JsonSyntaxException("Missing field " + var1);

throw new JsonSyntaxException("Expected " + var1 + " to be a string, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a string");

return new JsonSyntaxException("Expected " + var1 + " to be an item, was unknown string '" + var2 + "'");

throw new JsonSyntaxException("Expected " + var1 + " to be an item, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find an item");

throw new JsonSyntaxException("Expected " + var1 + " to be a Boolean, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Boolean");

throw new JsonSyntaxException("Expected " + var1 + " to be a Double, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Double");

throw new JsonSyntaxException("Expected " + var1 + " to be a Float, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Float");

throw new JsonSyntaxException("Expected " + var1 + " to be a Long, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Long");

throw new JsonSyntaxException("Expected " + var1 + " to be a Int, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Int");

throw new JsonSyntaxException("Expected " + var1 + " to be a Byte, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Byte");

throw new JsonSyntaxException("Expected " + var1 + " to be a Character, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Character");

throw new JsonSyntaxException("Expected " + var1 + " to be a BigDecimal, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a BigDecimal");

throw new JsonSyntaxException("Expected " + var1 + " to be a BigInteger, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a BigInteger");

throw new JsonSyntaxException("Expected " + var1 + " to be a Short, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a Short");

throw new JsonSyntaxException("Expected " + var1 + " to be a JsonObject, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a JsonObject");

throw new JsonSyntaxException("Expected " + var1 + " to be a JsonArray, was " + getType(var0));

throw new JsonSyntaxException("Missing " + var1 + ", expected to find a JsonArray");

throw new JsonSyntaxException("Missing " + var1);

return "null (missing)";
         return "null (json)";
         return "an array (" + var1 + ")";
         return "an object (" + var1 + ")";
               return "a number (" + var1 + ")";
               return "a boolean (" + var1 + ")";

throw new JsonParseException("JSON data was null or empty");

throw new IllegalArgumentException("Couldn't write " + String.valueOf(var1.getClass()));

In same Directory, but in

NullOps.java

were found these Strings:

return "Not a number";
         return "Not a boolean";
         return "Not a string";
         return "Not a map";
         return "Not a list";
         return "Not a byte list";
         return "Not an int list";
         return "Not a long list";
      return "Null";

Possibly in the same Directory affected

ProblemReporter.java

return " at " + var10000 + ": " + String.join("; ", (Iterable)var0.getValue());

I also found

net\minecraft\nbt\NbtOps.java

This file also contains similar with

NullOps.java

But it also contains "MapLike[{}]" and others.

Also it affected 1.18.2 and probably the Versions that much older that 1.18.2 and up to 1.19.4 Pre-release 2.

Thank you for your report!
After consideration, the issue is being closed as Won't Fix.

Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.

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