ics-calendar-label goes wrong

Thanks to making this great and useful plugin.
I’m using v4.6.0 and it shows wrong month on ics-calendar-label and ics-calendar-select.
My ics file has 2 events on Nov 2019 both, but ics-calendar-label and ics-calendar-select shows only 10/2019.

I think this trouble occurs after update to v4.6.0.

I put print_r($ics_data) below. *edited
===from===
Array
(
[guid] => xxxxxxxxxxxx-yyyy-yyyy-yyyy-xxxxxxxxxxxx
[title] => TITLE
[description] =>
[events] => Array
(
[2019] => Array
(
[11] => Array
(
[29] => Array
(
[t120000] => Array
(
[0] => Array
(
[label] =>
[eventdesc] => XXX
XXX
XXX
[location] => TITLE
[organizer] =>
[url] =>
[attach] =>
[dtstart_time] => 120000
[dtend_time] => 130000
[feed_key] => 0
[start] => 3:00 AM
[end] => 4:00 AM
)

)

)

[30] => Array
(
[t130000] => Array
(
[0] => Array
(
[label] =>
[eventdesc] => XXX
XXX
XXX
[location] => TITLE
[organizer] =>
[url] =>
[attach] =>
[dtstart_time] => 130000
[dtend_time] => 140000
[feed_key] => 0
[start] => 4:00 AM
[end] => 5:00 AM
)

)

)

)

)

)

[colors] =>
[feed_titles] => Array
(
[0] => WP_BOOKING_PACKAGE-4
)

[timezone] => Array
(
[https://example.com?id=4&ical=dummydummydummydummy] => Asia/Tokyo
)

[latest] => 201911
[earliest] => 201911
)
===end===

Thanks