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This thread is resolved. Here is a description of the problem and solution.
The following message is showing in the Query Monitor report.
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '='
Here is how the user solved this problem.
In phpMyAdmin, for the tables icl_strings, icl_pages and icl_urls, I re-applied the ut8_unicode_ci collation while checking the box "Change all column collations". The warning disappeared inQuery Monitor.