Parameter substitutions in general are coloured incorrectly

[cD1rtX3]

The code with a problem is:

echo "${1:-Nothing}"

It looks like:

It should look like:

The Nothing is a string and should be brown.

[cD1rtX3]

This is misleading to someone just learning about parameter substitutions, because it makes it look like Nothing will be subbed as a variable, when it's actually a string.

[cD1rtX3]

This code:

printf %s\\n "${1-$(date -u +'%-H:%M on %-d %B %+4Y')}"

prints either the first argument or the current time and date, and works correctly, but isn't highlighted correctly.

[cD1rtX3]

bruh