Mimetype Warning after upgrading to 28.0.9 or 29.0.5

solved by commit:

https://github.com/nextcloud/server/pull/47378/commits/9be51b38e3c1c6df19e550d68c230932062cad18

edit file
in folder nextcloud

/lib/private/Repair/RepairMimeTypes.php

find line

if (version_compare($mimeTypeVersion, '30.0.0.0', '<') && $this->introduceExcalidrawType()) {

edit then

if (version_compare($mimeTypeVersion, '29.0.5.0', '<') && $this->introduceExcalidrawType()) {

finish

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