Cleveref: Expected `</xref>` but got `</xref-group>` error

[djn-ams]

An update to cleveref functionality seems to have broken some types of references.

For example,

%% Loading AMS metadata                                                                  
%% Loading /ams/web/journals/mcom/2024-93-350/S0025-5718-2024-03952-2/S0025-5718-2024-039
52-2.xml                                                                                 
Exiting <back>                              
(mcom3952.aux)                                                                           
Resolving \ref's and \cite's                
Resolved 181 references and 134 cites                                                    
Resolving <cref>s                           
! Expected </xref> but got </xref-group>.                                                
<unknown>, l. 0>                            
                 \cref{sec:analytic}                                                     
                                            
! Current element name 'xref' does not match 'xref-group' in pop_element!.               
mcom3952.tex, l. 3169>                      
                       \cref{sec:analytic}                                               
                                            
! Expected </xref> but got </xref-group>.      
...

See https://github.com/AmerMathSoc/mcom/issues/783 for details.

[davidmjones]

The problem is that the authors overrode \crefdefaultlabelformat. I made that an error.