v11.1.23 - specifically ‘fix: Rounded tax amount in salary slip’ (Merge pull request #17348 from nabinhait/salary-slip-rounded · frappe/erpnext@b890492 · GitHub).
All earning and deductions are being rounded since commit was merged.
We have no requirement for these values to be rounded, so there should be a way (please advise if there is) to disable the rounding of Salary slip earning/deductions in HR settings.
EDIT: Github issue created
https://github.com/frappe/erpnext/issues/17501