You can't specify a default value in the option. According to the documentation for the choice
input, the first option will be the default.
The potential choices, one per line. The value on the first line will be the default.
You can see this in the documentation source, and also how it is invoked in the source code.
return new StringParameterValue(
getName(),
defaultValue == null ? choices.get(0) : defaultValue, getDescription()
);
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