Stringequals not comparing placeholder values

Use this:
- particles{p=flame;a=100;s=0.3} @Self ?stringequals{v1=<caster.name>;v2=YOURNAME}

The condition to check the caster name does not appear to function. It results in this error:

MM versions: 5.3.2 Build: a82ea99c Paper: 1.19.4