Version 1.18.0+dfsg-1 of r-bioc-dada2 is marked for autoremoval from testing on Sat 27 Feb 2021. It depends (transitively) on r-bioc-shortread, affected by #980082. You should try to prevent the removal by fixing these RC bugs.
Last update: 2021-01-24
Standards version of the package is outdated.
The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.5.1 instead of