Updater leads to dashboard (27.0.0. -> 27.1.0)

We’re running nextcloud hub 4 on a shared hosting (All-Inkl.com) and we’re ok with the restrictions.

A new cloud was installed for testing purposes some weeks ago - nextcloud hub 5, version 27.0.0 - and now I can’t update to 27.1.0, because after clicking “continue update” I see the dashboard again.

Also - scan.nextcloud.com tells me version 26.0.0.11

Should I start from scratch?