I found this from getsupport.atlassian.com.
Steps to reproduce:

• I search for 1st time and it returns 4 issues. E.g. https://getsupport.atlassian.com/browse/PA-2123?jql=text%20~%20%22engage-436%22
• I open a new tab and search 2nd time and it return 1 issue
• I go back to the previous tab, choose Tools > Bulk Change > All 4 issues
• The next screen is showing 1 issue only (which is the result of the 2nd search)

Expectation is the 4 issues (which is result from the 1st search) instead of 1 issue (result from the 2nd search)

The recorded video to reproduce: https://youtu.be/riHpMV11SdY