I noticed that you filtered the input very carefully.
But there are still some parts you missed
1.Login in URL : https://demo.pimcore.fun/admin.
2.Go to “Search Documents” and filter only “Snippet” search and press search.
3.Go to “/en/shared/teasers/Popular Brands”.
4.In the Edit section, press the “Edit Link” icon and edit the “Text” section -> enter the following xss:
<img src>
5.Save and the xss has been executed.
https://drive.google.com/file/d/18LNVcoZsluPMWb_VvHJkI_iKtpES_iLV/view?usp=sharing