https://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=10493&keyword=&tag=-1&request_locale=ja

the ruling in the database was wrong but fixed now

https://github.com/Fluorohydride/ygopro-scripts/pull/1821

Fixed an issue that Shadow Impulse could activate when a Synchro monster was destroyed from places other than monster zone.

add: str2

copy effect of a union monster and equip with gain effect