[Proftpd-user] Timestamp hidden after file open

Hi!
I need help about the following problem: timestamp of a file disappears from mapped drive in Internet explorer after file is just opened and discarded without save.
This problem appeared when new CPU was installed with OS Fedora 29 Workstation 64 bit and proFTPd 1.3.6-17 server. On old CPU with Fedora 23 64 bit and Proftpd v.1.3.5a-5 this problem was not present (same client).
That is why I look for some wrong settings on the new proFTPd server. Though I copied most of the proftpd.conf file.

  Here are my settings:
FTP client: WebDrive, SFTP key authentication
Local time client & server during the test: 2019-04-23 about 20:30

I do steps 1-2-3-4 and what puzzles me is the missing timestamp in step 3.
                                               Name     Date modified
1. Log directory:                     ABS.ods  22.04.2019  17:20
2. Open–close without save: ABS.ods  22.04.2019  17:20
3. Refresh directory list:        ABS.ods 
4. Disconnect&reconnect:      ABS.ods  22.04.2019  17:20    

sftp.log:
2019-04-23 20:31:14,792 mod_sftp/1.0.0[8913]: requested read offset (96000 bytes) greater than size of '/porachki/ABS.ods' (67864 bytes)
2019-04-23 20:31:14,792 mod_sftp/1.0.0[8913]: requested read offset (128000 bytes) greater than size of '/porachki/ABS.ods' (67864 bytes)
2019-04-23 20:31:14,792 mod_sftp/1.0.0[8913]: requested read offset (160000 bytes) greater than size of '/porachki/ABS.ods' (67864 bytes)
2019-04-23 20:31:18,174 mod_sftp/1.0.0[8914]: unrecognized file type 0 requested (protocol version 4)
2019-04-23 20:31:18,174 mod_sftp/1.0.0[8914]: client set access time of '/porachki/.~lock.ABS.ods#' to Tue Apr 23 17:31:20 2019
2019-04-23 20:31:18,174 mod_sftp/1.0.0[8914]: client set modification time of '/porachki/.~lock.ABS.ods#' to Tue Apr 23 17:31:17 2019

Directory access is defined with: 
<Limit READ DIRS WRITE>

I have added timezone in proftpd.conf:
SetEnv TZ Europe/Sofia
TimesGMT         off

What am I missing?

Andrey

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