The old Ubuntu MATE developer team stepped down PRIOR to release of Ubuntu 26.04 LTS, thus [Ubuntu MATE] were not involved in that release.
There is a new Ubuntu MATE development team though, who introduced themselves earlier this year
They’ll have their first release with Ubuntu MATE 26.10 in October.
Addendum: Ubuntu MATE 26.04 is still on-topic here, as outlined in the list of currently supported releases
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