python – Conda gives InvalidArchiveError for qt6-main – seeking backwards is not allowed

I’m trying to install PySide6, which requires qt6-main, using conda. During the install (‘conda install qt6-main -c conda-forge’), I get the error:

InvalidArchiveError('Error with archive C:\\Users\\Username\\Anaconda3\\pkgs\\qt6-main-6.4.2-hc84ccb7_3.conda.  You probably need to delete and re-download or re-create this file.  Message was:\n\nfailed with error: seeking backwards is not allowed')

I have tried and this happens for versions 6.4.2 to 6.4.0. Is this a problem with conda, with the archive or with something else?