Tried to convert DB to 4byte and failed

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[Solved] Follow 15.0.6 upgrade, enable mysql 4-byte characters, and failed at last step

The upgrade is done smoothly. As usual, I check the NC backend and follow all advices recommended. This time, it includes enabling emojis. I follow this link till the last line. https://docs.nextcloud.com/server/15/admin_manual/configuration_database/mysql_4byte_support.html and receive the following error message I tried $ sudo -u www-data php occ maintenance:repair --include-expensive but seems it is making the situation worse. My NC is now in maintenance mode. I read but do not fol…