Works in the help vault (no plugins or themes) to copy the icon to the search field, but the tag itself is read as a series of nested tags because forward slashes are used for nesting:
Hmm ok thanks, I especially tried to disable all my plugins, but I think I forgot to restart Obsidian. I will try to find which plugin could be responsible. Thank you!
If I disable the “Twitter emoji” flag from the “Emoji Toolbar” it seems to work everything as expected. @Angel Thank you again for the hint.