Individual entries in the user-defined document properties appear to be sorted incorrectly (I suspect in US-ASCII order).
For Example: 'Ä' follows 'Z'.
See also enhancement request in Bug 123918.
In the dialog to insert such user-defined field values, the ordering is correct ('Z' follows 'Ä'), however.
confirm with Version: 184.108.40.206.alpha0+
Build ID: 732d630c3d2a168c725c18e4dd8df7a0a4f85566
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3;
and Version 220.127.116.11.alpha0+ (Build ID: efca6f15609322f62a35619619a6d5fe5c9bd5a)
Would be really good to have a more logical order for non-English users.
As an example: user Jeeped described it in the following MS help comment: https://answers.microsoft.com/en-us/msoffice/forum/all/excel-sorting-is-not-in-ascii-order/36a6d145-89e5-44b9-b0c4-e49c92135808 (see also his linked Excel file with a sort order)
"The soft order that Excel uses has to do with language. If a strict ASCII code ordinal was used, a lower case a would come after the upper case Z and several special characters. When Excel sorts alphabetic strings, all of the following characters come before a B,
A a ª Á á À à Â â Ä ä Ã ã Å å Æ æ
... which makes more sense when sorting alphabetic strings in a multilingual product. ..."