Command suggestion flashes while typing when mouse cursor is currently selecting different suggestion

The bug

The command suggestion displayed in the chat text field and in the suggestion list flashes when you have the mouse cursor above a different suggestion while typing.

How to reproduce

1. Type or copy the following

   /summon 
   

2. Move your mouse above any suggestion except the first
3. Start typing minecraft
   → The suggestion flashes, showing the first entry (minecraft:area_effect_cloud) for a short moment before switching to the hovered over suggestion