The previous question didn't have an answer, so I went back to the old version of PHP. And everything works as usual.
Now testing October v.2 for an update, and again an error has occurred:
We're sorry, but an unhandled error occurred. Please see the details below.
SQLSTATE: Syntax error or access violation: 1055 Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'octoberdb.radiantweb_generated_dates.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by (SQL: select * from
radiantweb_generated_dates where event_date >= 2021-05-15 group by
event_id order by
sttime asc limit 10 offset 0)
~/vendor/laravel/framework/src/Illuminate/Database/Connection.php line 669