App Version: 72.0.3626.15 beta
iOS Version: 11.4.1, 12.0.1
Devices: iPhone 8, iPhone X, iPad Air, iPhone6 plus, iPad Pro

Steps to reproduce:
Launch iOS Chrome
Navigate to a page with text (e.g. news article)
Long press on a section of text and copy it by tapping on  'Copy'
Use the handles to highlight a larger selection of text spanning more than one paragraph.
Open FIP (Menu > Find in page).
Long press on the search box and select 'Paste'.
Clear the search box and enter a different term.

Observed results:
Count fails to get displayed and the navigation keys are disabled in FIP after deleting a paragraph from search

Expected results:
Exact count should be displayed along with scrolling across found words using navigation keys

Number of times you were able to reproduce: 5/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes
Bug reproducible on Chrome Mobile on Android: NA
Bug reproducible on Safari/Firefox: Firefox: NA, Safari: NA
Bug reproducible on the current stable build :M71, No
Bug reproducible on the current beta channel build : M72, Yes

Type-bug-regression? Yes

Link to Image/Video:
https://drive.google.com/open?id=1NgQCD8HG_F94jrQe80WzNAsQbqd8u4KG

Behaviour in Stable:
https://drive.google.com/open?id=10Ozp9Qs3YHcS5qZUcqEjWOLhxg-4vtdY