Looks like it is because of the flag: is_play_store_app_search_enabled_ https://cs.chromium.org/chromium/src/ui/app_list/views/search_result_tile_item_view.cc?dr=CSs&l=110

I think for start page, which has SearchResult::DISPLAY_RECOMMENDATION, the layout should not be controlled by is_play_store_app_search_enabled_ flag, instead it should be enabled/disabled just by is_fullscreen_app_list_enabled_ flag.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ec6c1b3f0dbfc303a1517e0513a411e3d1068bb7

commit ec6c1b3f0dbfc303a1517e0513a411e3d1068bb7
Author: Qiang Xu <warx@chromium.org>
Date: Thu Jul 13 18:02:08 2017

app_list: use EnableFullscreenAppList for SearchResultTileItemView UI and layout

changes:
The general SearchResultTileItemView layout and UI should be controlled by
EnableFullscreenAppList flag. Those Play Store related views are enabled by
EnablePlayStoreAppSearch, like rating_, rating_star_, price_, badge_. By
checking if they are nullptr, that is equivalently checking
EnablePlayStoreAppSearch flag.

Bug:  741073 
TEST: tested without EnablePlayStoreAppSearch flag, it behaves correctly now.
Change-Id: I6ae4313698e428760fec024c487590672bda40aa
Reviewed-on: https://chromium-review.googlesource.com/567488
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486436}
[modify] https://crrev.com/ec6c1b3f0dbfc303a1517e0513a411e3d1068bb7/ui/app_list/views/search_result_tile_item_view.cc
[modify] https://crrev.com/ec6c1b3f0dbfc303a1517e0513a411e3d1068bb7/ui/app_list/views/search_result_tile_item_view.h