If you paste the URL directly into Gutenberg, the URL parameter with the ID may be removed depending on the interference of the plug-ins installed, and the refer-a-friend URL may not work properly. In this case, you can use a custom HTML tag to reflect the URL. xxx” is a unique ID.
<a href="https://quarka.org/friends/?uid=xxx">QA Heatmapのお友達無料ライセンス取得フォーム</a>