Some tconst titles missing from titles.basic.tsv

There are tconst entries that appear to be missing from titles.basic.tsv.  The entry tt0055928 , "Dr. No", was missing for a few days, but is present once again.  Here is are some missing entries of which I am aware, but there could be others as well.  Nor do these tconst values have any entries in the title.crew.tsv, title.ratings.tsv, or title.episode.tsv files. 

 tt0562856
 tt0562972
 tt0811753
 tt0811802
 tt0811803
 tt0811804
 tt10756720
 tt10927782
 tt10927786
 tt10927788
 tt10927792
 tt10927794
 tt11252880
 tt11301906
 tt11669800
 tt12919806
 tt12919828
 tt13056134
 tt13056158
 tt13286384
 tt13286388
 tt13422242
 tt13422246
 tt13431146
 tt13675380
 tt13675384
 tt13825212
 tt14739882
 tt14883030
 tt14921134
 tt15130830
 tt15588572
 tt15806014
 tt1747582
 tt1752041
 tt1771906
 tt18231284
 tt18258626
 tt4462678
 tt6579350
 tt8084176
 tt8893678