Approval meeting from mobile devices change the meeting time

[Jul]

Hi!
We have a problem:
Somebody creates a meeting for several participants (e.g. at 10.00 AM). Some of the participants approve this meeting from Desktop, some of them - from mobile devices. And it works OK.
When creater changes time of meeting (e.g. at 03.00 PM), sends new invitations and some participant approves the meeting from PHONE (from web browser or from mobile app) then the meeting at creator account has gone to first time state (at 10.00 AM).
Another participants still have this meeting at 03.00 PM.

So, we can't use mobile devices for approving meetings now.
What could be problem with?

Single server
Release 8.8.15.GA.3869.UBUNTU18.64 UBUNTU18_64 NETWORK edition, Patch 8.8.15_P34.
Android 11-13

[Klug]

https://wiki.zimbra.com/index.php/Zimbr ... 8.8.15/P35

.../...
Fixed a bug that caused a single instance of an appointment to be moved to the original time in the organizer’s calendar when the attendee accepts the invitation.
.../...

[Jul]

https://wiki.zimbra.com/index.php/Zimbra_Releases/8.8.15/P35

Ohhh!
That's cool! I will install.