xml: Extmarks in single/closed tag marks all text inside <>

[kaddkaka]

Explain the issue

1. What vim version are you using? neovim 0.10.2 with TreeSitter highlighting and additional_vim_regex_highlighting = true.
2. Steps to reproduce
   In an xml file with this context:

<a banana/>
 ^^^^^^^^    Having cursor on any of these characters, will
 ^^^^^^^^^    highlight all of these characters

3. Expected behavior
   Only show highlights for the matching pair< and >

Minimal vimrc file

Let me get back to this