Custom sidebar (homepage) disappeared - URGENT


Just updated Custom sidebars and got an really unpleasant surprise.
Homepage sidebar does not show.
Tried to change sidebar by the page because log says "If the front page is a page, then we have now the same rules like we have on a page." but I do not get it.
Multisite installation. main site and also subsites have now no sidebar by the homepage.

Please Help!!!

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