Confirmed, even with the latest version from the Git master branch.

Specify your timezone set in SOGo's preferences and the date you created that event.

<key>SOGoTimeZone</key>
<string>Europe/Prague</string>

and this is the same setting which I have in my User Preferences in SOGo Web Calendar.
All-day Event is created in SOGo Web Calendar for Nov-19 and is displayed in Nov-19 and Nov-20 in the Day View.

I can reproduce the issue with the values you provided, thanks.

Can you try this patch?

diff --git a/UI/Scheduler/UIxCalListingActions.m b/UI/Scheduler/UIxCalListingActions.m
index 8ef47f0..0e37d3b 100644
--- a/UI/Scheduler/UIxCalListingActions.m
+++ b/UI/Scheduler/UIxCalListingActions.m
@@ -723,6 +723,11 @@ _userStateInEvent (NSArray *event)
if (eventEnd > endsSecs)
eventEnd = endsSecs;

• if (eventEnd < startSecs)
• // The event doesn't end in the covered period.
• // This special case occurs with a DST change.
• return;

•        userState = _userStateInEvent (event);
         while (currentDayStart + dayLength < eventEnd)
           {

This patch fixes the issue for me (patch applied against the latest git master branch)

Fixed.

See https://github.com/inverse-inc/sogo/commit/3e8f7cb29ea5034554669dd87d9f210903440b3d