We're in the process of releasing duckdb 0.9.0. Running your checks with the updated duckdb version revealed problems: https://github.com/duckdb/duckdb-r/blob/main/revdep/problems.md#mlr3db . We would like to send the update to CRAN as soon as possible.

duckdb 0.9.0 might reorder rows more aggressively than previous versions did. If your queries rely on a particular row output order, please make sure that you specify it.

Can you please confirm? Installation instructions on https://github.com/duckdb/duckdb-r/tree/main#installation-from-r-universe are up to date. Thanks!

CC @hannes.