trailingWhitespace: true not honored when editor.formatOnSaveMode: modifications

[Geokureli]

With the following in .vscode/settings.json:

"[haxe]": {
	"editor.formatOnSave": true,
	"editor.formatOnSaveMode": "modifications"
}

...and the following in hxformat.json

"indentation":{
	"trailingWhitespace": true
}

...Haxe-Formatter will automatically remove trailing whitespace in all modified lines, if I remove "editor.formatOnSaveMode": "modifications" trailing whitespace is then allowed. This is the case whether I add trailing whitespace to existing empty lines or add entirely new empty lines with trailing whitespace