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Typo3 does not recognise utf8mb4

It can happen that Typo3 does not recognise the new UTF8MB4 format. A white page may be displayed or Typo3 may display a UTF8 error message. To solve the problem, you can update Typo3 to the latest version. Alternatively, the DatabaseConnection can be adapted as follows by commenting out the lines:

File: httpdocs/typo3/sysext/core/Classes/Database/DatabaseConnection.php in line ~1687.

# if ($charsetVariables[$variableName] !== $this->connectionCharset) {
# $hasValidCharset = FALSE;
# break;
# }