For my history and search settings,  (hostnames somewhat revised to prevent leaking information)
1. Type "mo" and see a list of suggestions including
  1. mo|ab.park.example.com as an inline autocomplete suggestion with a tab-to-search icon showing
  2. moab as a second suggestion, also with a tab-to-search icon showing
  3. maybe more suggestions
2. Press tab twice, the first time switches into keyword search mode for the first suggestion, the second time switch to the second suggestions but doesn't enter keyword search mode.
4. Press escape.

Expected result:
* Either the omnibox becomes blank (clears all edits)
or
* The omnibox reverts to what it was before I started pressing tab, i.e., the text "mo" in the omnibox, possibly with the inline autocompletion "ab.park.example.com"

Actual result:
* The omnibox reverts to the text "ab", with an inline autocompletion of ".park.example.com".

It seems like we're forgetting the original text, only remembering the inline autocompletion, yet trying to apply the cursor position from the original text.

By the way, pressing enter goes to the right place.