Incorrect render with TB 60.4.0/ LN6.2.4

[fabrixxm]

Hello,

the yearview works not correctly

at Ubuntu 16.10, Thunderbird 60.4.0 with Lightning 6.2.4, the year view
does not show all dates.

When calling from the year view it takes a long time until something is
displayed and then some of the appointments are missing. In the months/
weeks / day view of Lightning everything is available.

Before changing to Thunderbird 60.xx, this problem was not

thanks

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