PSA: We discovered a backward compatibility issue in Scala.js 1.18.0. It incorrectly reads dependencies compiled with Scala.js < 1.11. We have not announced the release, and (the default) Scala Steward will not prompt you to upgrade. We recommend you hold your upgrades until we release 1.18.1 with a fix.
Artifacts published with 1.18.0 are not polluted; using 1.18.0 is not dangerous for the ecosystem; the issue is only problematic if you run into it while upgrading. If you already successfully upgraded, there is no need to panic and revert.