For example, in this extension datalist isn't shown.
example extension
The arrow on the right side is visible, but the list is not shown when you enter the letter a, or when you click or double-click.

This extension works in other chromium browsers.

Windows version: Win 10 Pro, build 19044.1466
Opera version: Opera GX, LVL3 (core: 82.0.4227.50)