This is a test to see if active year highlighting works as a shortcode as both list and option format types:
[archives type="yearly" highlight="active-year"/]
Seems that archive pages in this theme is not processing shortcodes. Will switch to the latest Twentysomething theme and check again.
Interesting. Version 1.5.4 is not working well with twenty-nineteen and newer when using the shortcode in a block. Need to test is this works in a classic editor.
First, we updated to the latest RC on GitHub
[archives type="yearly" format="option" highlight="active-year"/]