wrong detection of outdates
The algorithm to detect an outdated extension is wrong. It only takes into account the highest version number. However a lower version number can support the most current TYPO3.
Example:
https://extensions.typo3.org/extension/watchwords/
"Outdated extension This extension supports none of the currently supported TYPO3 core version"
1.2.2 / stable October 15, 2018 modifications of composer.json 6.2.0 - 8.99.99