TM does not generate valid ODF documents

[lgsl]

Out of curiosity I used https://odfvalidator.org to validate if a very basic odt document (just, text. No styling, no comments, no changes tracked) created in TextMaker was valid or not. It is not. The document is NOT conformant ODF1.0.

Here are the results for the attached dummy document:

Lorem.odt: Info: ODF version of root document: 1.0
Lorem.odt/mimetype: Error: There shall be no extra field for the 'mimetype' zip entry of ODF package 'Lorem.odt'!
Lorem.odt/mimetype: Error: For more information on ODF package conformance see https://docs.oasis-open.org/office/v1.0 ... 1.0-os.pdf
internal:/schema/odf1.0/OpenDocument-manifest-schema-v1.0-os.rng: Info: parsed.
Lorem.odt/META-INF/manifest.xml: Info: no errors, no warnings
Lorem.odt/mimetype: Info: 2 errors, no warnings
Lorem.odt: Info: Media Type: application/vnd.oasis.opendocument.text
internal:/schema/odf1.0/OpenDocument-schema-v1.0-os.rng: Info: parsed.
Lorem.odt/meta.xml: Info: Generator: TextMaker
Lorem.odt/meta.xml: Info: no errors, no warnings
Lorem.odt/settings.xml: Info: no errors, no warnings
Lorem.odt/styles.xml: Info: extension attribute 'textmaker:pgf-auto-space-after' of element <style:paragraph-properties> found and ignored.
Lorem.odt/styles.xml: Info: extension attribute 'textmaker:pgf-auto-space-before' of element <style:paragraph-properties> found and ignored.
Lorem.odt/styles.xml: Info: no errors, no warnings
Lorem.odt/styles.xml: Info: 2 extension attributes from the following namespace were found: tm
Lorem.odt/content.xml: Info: no errors, no warnings
Lorem.odt/content.xml: Info: 2 extension attributes from the following namespace were found: tm
Lorem.odt: Info: 2 errors, no warnings