What field(s) is the Timesheet > Add Tasks > Search window using?
Release : 16.0.0
Component :
Based on the APP access log entry, the Modern timesheet task search uses the following per the REST API call for that resource timesheet task filter:
1. name startsWith = ?
or
2. code startsWith = ?
and
3. isOpenForTE true
It does not coincide to the classic lookup (Browse All Tasks) autosuggest configuration.