W7 beta 13 - Spinner Disappears in Browser

Wappler Version : W7 beta 13
Operating System : Windows
Server Model: Nodejs
Database Type: MariaDB
Hosting Type: local

Expected behavior

What do you think should happen?

Is it possible to include the spinner in a button

Actual behavior

What actually happens?

After including the spinner in the button, it should remain visible for use.

How to reproduce

Add a spinner to the button. It will be visible, but when you save the page, it will not appear in the preview, but it is still in the code.

When testing in the browser, the spinner's HTML tag disappears; it is not in the code.

See the screenshots.

It seems that nothing can be inside the <button> tag.

in wappler.

in Google Chrome