Version 0.15.2+dfsg-1 of silx is marked for autoremoval from testing on Fri 29 Oct 2021. It is affected by #994377. The removal of silx will also cause the removal of (transitive) reverse dependencies: binoculars, pyfai. It depends (transitively) on python-fabio, affected by #994353. You should try to prevent the removal by fixing these RC bugs.