Continuing issues with audio files on Safari

The following experiments seem to be failing to play mp3 files on Safari in 2021.2.3

https://run.pavlovia.org/Wake/dictation-sentences/

https://run.pavlovia.org/Wake/spelling/

The error is Decoding audio data failed as per this thread.

The solution in that thread was to convert to .wav but elsewhere the same error occurs with wav files.

I did think this might be related to:

psychoJS._serverManager.prepareResources([{name: conditionsFile,path: conditionsFile}]);

but dictation-sentences using Experiment Settings / Online instead of a coded solution.

The bit rate is 44.1KhZ 32 bit float. Here is a sample file.

Has anyone managed to solve playing mp3 files (or wav files) cross-Browser?