Clear All occasionally does not work

[Cosmicbase]

• I confirm that this is an issue rather than a question.

Bug report

Steps to reproduce

When I send a color or effect via the Hyperion app or ioBroker hyperion_ng, the LEDs come on. Then I delete the colors and effects. They are also no longer visible in the remote control, but the LEDs remain on.
Only when I stop the Hyperion Service with "sudo systemctl stop hyperiond@pi.service" and with "sudo systemctl stop hyperiond@pi.service"
If you start again, colors and effects can be deleted and the LEDs also go dark.

What is expected?

LED-Devices: LED's retain last state after clearing a source for example (#1008)

What is actually happening?

LEDs occasionally stay on even though the source is switched off. Normally they would have to switch to black.

System

Hyperion Server:

• Build: (HEAD detached at pull/1210/merge) (GitHub-5b8b5ca5/cd473c78-1615394428)
• Build time: Mar 10 2021 17:00:45
• Git Remote: https://github.com/hyperion-project/hyperion.ng
• Version: 2.0.0-alpha.9-PR#1210
• UI Lang: auto (BrowserLang: de-DE)
• UI Access: default
• Avail Capt: dispmanx,v4l2,framebuffer,qt
• Database: read/write

Hyperion Server OS:

• Distribution: Raspbian GNU/Linux 10 (buster)
• Architecture: arm
• CPU Model: ARMv7 Processor rev 3 (v7l)
• CPU Type: Raspberry Pi 4 Model B Rev 1.1
• CPU Revision: b03111
• CPU Hardware: BCM2711
• Kernel: linux (5.10.17-v7l+ (WS: 32))
• Qt Version: 5.7.1
• Python Version: 3.5.3
• Browser: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML