Friendly URLs deleting capital letters from alias

I have a site that, as far as I can tell, since upgrading to Revo 2.3 (hosted on MODX cloud), when duplicating a resource, the alias produced seems to delete any capital letter from the URL. See screenshot attached. I have several other sites on cloud and none of them have this issue.

At first I thought it might be a RegEx issue with the FURL Alias Character Restriction setting but this is the same as with the other sites. The setting is:



As far as I can tell there is no difference in any of the settings that should influence this and even when I snapshot the site and start a dev version it doesn't have the same issue. Does anyone have any idea of why this might be happening?

What is the setting for the System Setting friendly_alias_lowercase_only?

It's set to Yes, but this is set the same on all my other sites that don't have the problem.

I thought that setting would convert uppercase to lower, not delete them?

I reinstalled 2.3.1 and then updated to 2.3.2 so hopefully it will fix the problem. The first new resource I created was OK, fingers crossed my client doesn't still have the problem.