Yes, as Michael says, this is a bug deep in the Moodle core, so difficult to work around. As Tim Hunt has commented, regarding the offending
MDL72058: "This was a terrible, mis-conceived idea. [...] I think it needs to be reverted". I had hoped for a fix by now.
There is a script in CodeRunner (navigate to <moodlehome>/question/type/coderunner/downloadquizattempts.php) to download all actions by all students on a given quiz in a raw database CSV dump. This script is also affected by the bug, but the master branch on github includes a workaround for it. There's also a script
quizsubmissions.py to help deal with the complex download you get.
The updated CodeRunner version (5.2.4) is not yet in the Moodle plugin repository. [We like to exercise new versions for several weeks on our production servers before updating the main repository and it's too quiet around our University at present to provide useful testing.] But you might be able to persuade your sysadmins to at very least pull the updated file
getallattempts.php. It's used only by the downloadquizattempts script.