Error about database on upgrade to 4.4.2

[SemaphoreOxalis]

Before upgrading
We have

• clean cache
• delete many extention
• run a complete collation utf8mb4_general_ci in phpmyadmin
• uninstall all major extention (komento, acymailing...) : no error on precheck

But each upgrade give these errors :
Alerte

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JInstaller: :Install: erreur SQL Illegal mix of collations (utf8mb4_unicode_ci,IMPLICIT) and (utf8mb4_general_ci,IMPLICIT) for operation '='

danger

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Table 'sc1oxalis_joo371.josbe_guidedtours' doesn't exist

Brief list of captured errors

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installer::parseSchemaUpdates finished with "false" result.

The guided tours are not a real issue : we can discover it after. But the collation issue and the parsescehma error seems bad news even if the backoffice seems to work...

Thanks for your help