If you ever come across this kind of error message in your WordPress debug.log (assuming that you have debugging enabled) … WordPress database error Illegal mix of collations (utf8mb4_unicode_520_ci,IMPLICIT) and (utf8mb4_unicode_ci,IMPLICIT) … … then you have a query that involves tables which have clashing collations. In my case, one table used utf8mb4_unicode_520_ci for a row […]
