Error message "Tried resolving a template file for controller action "Content->standard" in format ".html"" after update

[blueamerican]

TYPO3 10.4.28
flux 9.7.4

After upgrading flux from 9.4.0 to 9.7.4 is get the following error message in BE on every page:

Tried resolving a template file for controller action "Content->standard" in format ".html", but none of the paths contained the expected template file (/html/typo3/typo3_src-10.4.28/typo3/design/Templates/ContentStandard.html). The following paths were checked: /home/www/p/html/typo3/typo3conf/ext/flux/Resources/Private/Templates/, /home/www/p/html/typo3/design/Templates/

In the content element wizard i have a strange empty new element "content-flux_standard", see screen

Anybody an idea what the reason for this could be?

[blueamerican]

This is the strange new content element.. no idea where it comes from

[blueamerican]

in this ticket a related issue is discussed

#2025

If i try to add the "Default Flux Content Type" element it searches for an template

public/typo3/design/Template/ContentStandard.html instead of public/typo3/design/Template/Content/Standard.html

[NamelessCoder]

This issue should be solved in the most recent release. There were a couple of problems resolving files in the special design folder that could have resulted in a wrong template file being used.

[blueamerican]

is solved this issue with creating these files:

typo3/design/Templates/ContentStandard.html

typo3/design/Templates/ContentContentStandard.html

typo3/design/Templates/ContentContentContentStandard.html