[Tickets #15027] Task synchronization from DavX5 causes DTSTART rewrite to UTC

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Ticket URL: https://bugs.horde.org/ticket/15027
------------------------------------------------------------------------------
  Ticket             | 15027
  Created By         | horde at 2600.sk
  Summary            | Task synchronization from DavX5 causes DTSTART rewrite
                     | to UTC
  Queue              | Horde Groupware
  Version            | 5.2.22
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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horde at 2600.sk (2020-07-22 12:36) wrote:

When synchronizing tasks via CalDAV, Horde rewrites DTSTART of all  
tasks to UTC and disregards the original timezone, for example:

data sent to Horde:
...
DTSTART;TZID=Europe/Vienna:20200722T160000
...

gets immediately rewritten to:

...
DTSTART:20200722T140000Z
...

and then synced back to the external client

I don't understand why Horde rewrites the timezone.
The timezone set in Horde settings matches the timezone of the  
external calendar.
Is it possible for horde to leave the timezone as is when synchronizing tasks?