The bottom toolbar can get into a state where it is difficult to get it to show again

[miDeb]

I found that this can happen when you scroll down while a page is still loading, for example on github:
recording
In this case, I guess the bug is in GeckoView: While the page is loading, it announces INPUT_RESULT_HANDLED but after loading INPUT_RESULT_HANDLED_CONTENT, so the toolbar gets stuck in an invisible state.
However, this can also happen if the site navigates to a different screen, for example if you open the drawer on https://duckduckgo.com/about while the toolbar is hidden, it is impossible to get the toolbar to show up again without first closing the drawer.
recording

┆Issue is synchronized with this Jira Task