[6039K] "reboot recovery" command not working as expected

I have the Idol 3 6039K (Dual SIM) model with latest firmware, Rooted and with TWRP Recovery 2.8.7.0 flashed on the phone.
Everything is working fine, only I have noticed that "Reboot to Recovery" via software is not working as expected. Not a big issue but I wonder if others have the same problem.

Details:
- Phone: Idol 3 model 6039K with latest firmware 5.0.2 build 01006
- Fastboot commands restored following instructions in this thread and rooted by booting the TWRP recovery image using fastboot and installing UPDATE-SuperSU-v2.46.zip file using TWRP.

Following commands are working from android terminal after entering "su" or from windows command prompt using adb:
- "reboot" => Phone reboots system as expected => OK
- "reboot bootloader" => Phone reboots in bootloader => OK.
- When phone has booted into bootloader the fastboot commands are working as expected => OK.

Booting into TWRP Recovery is working by turning OFF the phone and pressing Volume UP + Power buttons at the same time.
Reboot to Recovery from inside TWRP is also working.

Only the following is not working from android terminal or from windows using adb:
- "reboot recovery" => Phone does not reboot in TWRP Recovery but does a normal system reboot as if only "reboot" is entered.
- Also Reboot to Recovery using applications like Titanium Backup or Quick Boot app results in a normal system reboot instead of reboot to recovery.

Questions that I have:
- Can somebody let me know if the "reboot recovery" command is working on his/her phone?
- Has anybody an idea what could be the reason that reboot to recovery is not working on my phone? Could it be related to the firmware version that I use or could there be another cause?

Thanks in advance for any feedback or ideas.

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