Incorrect end time for non-recurrent events

[DanielHeath]

See attached reproduction script, using ical data exported from google calendar:

require "bundler/inline"

gemfile do
  source "https://rubygems.org"
  gem "icalendar-recurrence", "~> 1.2"
  gem "icalendar"
  gem "activesupport"
end

require "active_support"
require "active_support/core_ext"
require "icalendar/tzinfo"

ical_str = <<-ICAL
BEGIN:VCALENDAR
PRODID:-//Google Inc//Google Calendar 70.9054//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Jubilee Street
X-WR-TIMEZONE:Australia/Sydney
BEGIN:VTIMEZONE
TZID:Australia/Sydney
X-LIC-LOCATION:Australia/Sydney
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:GMT+10
DTSTART:19700405T030000
RRULE:FREQ=YEARLY;BYMONTH=4;BYDAY=1SU
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:GMT+11
DTSTART:19701004T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=1SU
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
DTSTART:20241018T220000Z
DTEND:20241019T050000Z
DTSTAMP:20241018T071435Z
UID:[email protected]
CREATED:20241018T070309Z
LAST-MODIFIED:20241018T070309Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:D&D
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR
ICAL

event = Icalendar::Calendar.parse(ical_str).sole.events.sole
occurence = event.occurrences_between(Date.parse("10 oct 2024"), Date.parse("30 oct 2024")).sole
puts 'By ical'
puts event.dtstart
puts event.dtend
puts 'By recurrence'
puts occurence.start_time
puts occurence.end_time

Expected: The sole occurrence of a non-recurring event ends at the same time the event ends.

Actual: The end time is a few seconds after the start time.

[DanielHeath]

The script outputs:

By ical
2024-10-18 22:00:00 UTC
2024-10-19 05:00:00 UTC
By recurrence
2024-10-18T22:00:00+00:00
2024-10-18 22:00:00 UTC