Just to reassure people, this latest vandalism is being dealt with. It needs to be done in one go as all the changeset objects are interlinked. As noted above, piecemeal reverts using tools such as Josm’s reverter plugin or https://revert.monicz.dev/ won’t work because they will just restore something to a previously bad state.
Edit: A revert has now fixed most or all of this. If you think that something is still wrong, please go through the checks above before reporting it - you may just be seeing it in your browser cache.