The issue is the same, it's non ascii encoding. The fix is in the eoan poppler 
update, let's SRU to disco
https://launchpad.net/ubuntu/+source/poppler/0.76.1-0ubuntu1

** Package changed: evince (Ubuntu) => poppler (Ubuntu)

** Changed in: poppler (Ubuntu)
       Status: Triaged => Fix Released

** Description changed:

- Package: evince
- Version: 3.32.0-1ubuntu0.1
+ Impact
+ Case-insensitive search of unicde chars in PDF documents is broken
  
- OS: Disco 19.04
- 
- How to reproduce:
- 
+ Test case
  1) Open the attached document in Evince
  2) Select the infinity symbol ∞ (U+221E) and copy it into clipboard
  3) Press Ctrl+F and paste the symbol from the clipboard into the search field
- 4) Observe that evince doesn't find the symbol (shows no results in the 
search pane and lightens the search field red). I expect that the symbol, on 
the contrary, is found (i.e., that the pane shows page 1 and some context of 
the symbol).
  
- In qpdfview and okular, the symbol is found, as well as in evince from
- the current debian stable. Any bugfix?
+ The symbol should be found in the document
+ 
+ Regression potential
+ Check in different pdf renderer using poppler than search still work correctly

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to poppler in Ubuntu.
https://bugs.launchpad.net/bugs/1829785

Title:
  Evince: ∞ not found

Status in Evince:
  Fix Released
Status in poppler package in Ubuntu:
  Fix Released

Bug description:
  Impact
  Case-insensitive search of unicde chars in PDF documents is broken

  Test case
  1) Open the attached document in Evince
  2) Select the infinity symbol ∞ (U+221E) and copy it into clipboard
  3) Press Ctrl+F and paste the symbol from the clipboard into the search field

  The symbol should be found in the document

  Regression potential
  Check in different pdf renderer using poppler than search still work correctly

To manage notifications about this bug go to:
https://bugs.launchpad.net/evince/+bug/1829785/+subscriptions

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