Timeshift skips some hourly backup.

[Xwang1976]

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Describe the bug
Timeshift skips some hourly backup.
I've set to keep 24 backups, but timeshift skips some backups as you can see from this list of hourly snapshots:

[andreak@n752vx snapshots-hourly]$ ls -all
totale 8
drwxr-xr-x 2 root root 4096 17 ott 15.03 .
drwxr-xr-x 9 root root 4096 17 ott 15.03 ..
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_06-00-01 -> ../snapshots/2019-10-16_06-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_07-00-01 -> ../snapshots/2019-10-16_07-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_08-00-01 -> ../snapshots/2019-10-16_08-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_10-00-01 -> ../snapshots/2019-10-16_10-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_11-00-04 -> ../snapshots/2019-10-16_11-00-04
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_13-00-01 -> ../snapshots/2019-10-16_13-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_14-00-01 -> ../snapshots/2019-10-16_14-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_15-00-04 -> ../snapshots/2019-10-16_15-00-04
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_17-00-01 -> ../snapshots/2019-10-16_17-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_18-00-01 -> ../snapshots/2019-10-16_18-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_19-00-01 -> ../snapshots/2019-10-16_19-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_20-00-04 -> ../snapshots/2019-10-16_20-00-04
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_22-00-02 -> ../snapshots/2019-10-16_22-00-02
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-16_23-00-03 -> ../snapshots/2019-10-16_23-00-03
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_01-00-02 -> ../snapshots/2019-10-17_01-00-02
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_03-00-01 -> ../snapshots/2019-10-17_03-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_04-00-02 -> ../snapshots/2019-10-17_04-00-02
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_06-00-01 -> ../snapshots/2019-10-17_06-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_07-00-02 -> ../snapshots/2019-10-17_07-00-02
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_09-00-03 -> ../snapshots/2019-10-17_09-00-03
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_11-00-01 -> ../snapshots/2019-10-17_11-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_12-00-01 -> ../snapshots/2019-10-17_12-00-01
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_13-00-02 -> ../snapshots/2019-10-17_13-00-02
lrwxrwxrwx 1 root root 32 17 ott 15.03 2019-10-17_15-00-01 -> ../snapshots/2019-10-17_15-00-01

It seems to skips a snapshot if the previous one has required more than one second.

Expected behavior
I expect that every hour a snapshot is made

System:

• Linux Distribution Name and Version: Archlinux 64bit
• Desktop [e.g. MATE, XFCE] KDE
• Application Version [e.g. v18.8] 19.08.1-2