It looks like some changes in lsp4e cause a newline to be appended when inserting a completion item:
results in:
@Value("${logging.charset.file}"
<*>)
(randomly picked the logging.charset.file property from the completion item list, the exact item doesn't really matter)
When pressing "undo", the added newline is removed again and everything looks fine, so it looks like somehow this return is added when applying the workspace edit or so.
This seems to happen in all our Java source code content-assist cases.