I'm afraid we have discovered a bug affecting 2.4.10 and 2.4.11 which can lead to data loss in certain situations.
We are currently testing a fix which we expect to release on Tuesday 15th October. In the mean time please view the link below to see if you are likely to be affected and what mitigating actions you should take:
https://totara.community/mod/forum/discuss.php?d=3352#p13858
We apologies for the inconvenience this may cause. I will provide an incident report detailing the events leading to this bug in due course.
Simon