download checker getting wrong version for plugins that do not have a 3.10 release.

Something seems wrong with the download checker when looking for plugin updates for Moodle 3.10

reported on:

https://moodle.org/plugins/report_coursesize
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After upgrade to 3.10, the plugin manager keeps reporting report_coursesize as outdated. But the version suggested is lower than that installed:

• installed plugin version: 2019052800
• version suggested: 2016051600 (There is a new version 2016051600 available!)

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2016051600 happens to be an old release for 3.1.

If you hit the following url you can see this reproduced:
https://download.moodle.org/api/1.3/updates.php?format=json&version=2020061502&branch=3.10&plugins=report_coursesize

If you swap out the "3.10" branch for "3.9"

https://download.moodle.org/api/1.3/updates.php?format=json&version=2020061502&branch=3.9&plugins=report_coursesize

You get no response for the report_coursesize which is what I would expect because we haven't published a version for 3.9