It seems that Mercurial bookmarks aren't pushed even if requested.

(bm is defined as an alias for bookmark in my ~/.hgrc.)

$ hg bm                                                                         
 * master                    55:e628ceaacbe1                                    
$ hg push -B master ssh://hg@hg.sr.ht/~sschwarzer/vppdiff                       
pushing to ssh://hg@hg.sr.ht/~sschwarzer/vppdiff                                
searching for changes                                                           
no changes found (ignored 11 secret changesets)                                 
exporting bookmark master                                                       
$ cd ..                                                                         
$ rm -rf vppdiff2                                                               
$ hg clone ssh://hg@hg.sr.ht/~sschwarzer/vppdiff vppdiff2                       
requesting all changes                                                          
adding changesets                                                               
adding manifests                                                                
adding file changes                                                             
added 45 changesets with 46 changes to 5 files                                  
new changesets 44de5497252e:df38be372399                                        
updating to branch default                                                      
5 files updated, 0 files merged, 0 files removed, 0 files unresolved            
$ cd vppdiff2                                                                   
$ hg bm                                                                         
no bookmarks set                                                                
$ hg incoming -B ssh://hg@hg.sr.ht/~sschwarzer/vppdiff                          
comparing with ssh://hg@hg.sr.ht/~sschwarzer/vppdiff                            
searching for changed bookmarks
no changed bookmarks found