What does 2 Chronicles 30:18 mean?

A lot of people from Ephraim, Manasseh, Issachar, and Zebulun had eaten the Passover meal without following the proper rituals. But Hezekiah prayed for them, saying, 'Lord, you are good—please forgive everyone who is honestly seeking you, even if they didn’t do everything right.' 2 Chronicles 30:18 - Modern Text Bible

(Many from the northern tribes didn’t follow the purification rules, but Hezekiah asks God to forgive them because their hearts are sincere.)