Text with <marquee> running on xibo-windows -client but not on xibo-linux-client

[Vatorinator]

Describe the bug
Text with running on xibo-windows-client but not on xibo-linux-client

To Reproduce
i use Docker xibo-cms 3.0,1 (ubuntu Server (21.4))
windows xibo-client 3.300.5 (Windows 10)
linux xibo-linux-client (ubuntu Desktop(20.04.1))
Linux player infos name: xibo-player
summary: Xibo Digital Signage Player
publisher: Xibo Signage (xibosignage)
contact: https://community.xibo.org.uk
license: unset
description: |
Create engaging digital experiences with Xibo. We're powering an Open Source Digital Signage
revolution.
commands:

• xibo-player.disabled-watchdog
• xibo-player.options
• xibo-player
  snap-id: 49j19QBkjBGJYVpX2fRfGgte8BIWrhby
  tracking: latest/edge
  refresh-date: heute um 11:07 CEST
  installed: 1.8-R6 (224) 183MB -
  hint#1: i do for testing reasons all in virtual box

hint#2: if i compile (snap) the 1.8-R6 from github for linux the same behaviour.
unfortunately i was not able to run the so far released prereleases (https://github.com/xibosignage/xibo-linux/releases) so i guessed with the edge installation i have the latest sw on my side.

i don't know from WHERE and WHAT on logs i can read/provide

hint#3: if i use a html tag in the widget it works in the same manner on windows and linux. But i guess that's not a real solution

greetings Georg