Applies to version 3.3.1 to up to latest (3.4.1). Not reproducible in 3.3.0.
When using the plugin to format xml content using prettier, the result content ends up with non-existing spaces in HTML character entities.
Codesandbox for version 3.3.0:
https://codesandbox.io/p/sandbox/prettierxmlplugin-3-3-0-k374wn?file=%2Fsrc%2FApp.js%3A6%2C1-9%2C15
Codesandbox for version 3.3.1:
https://codesandbox.io/p/sandbox/cocky-cray-gy83nr?file=%2Fsrc%2FApp.js%3A3%2C19
See how in 3.3.1 the result has spaces in character entities like <
and >