[bug] list/task by tag does not give correct result

This call https://www.openml.org/api/v1/json/task/list/tag/OpenML100/

tells me that the following task.ids are tagged with "OpenML100":

      3      6     11     12     14     15     16     18     20     21     22     23     24     28     29     31     32     36     37     41     43     45
     49     53     58    219   2074   2079   3021   3022   3481   3485   3492   3493   3494   3510   3512   3543   3549   3560   3561   3573   3889   3891
   3896   3899   3902   3903   3904   3913   3917   3918   3946   3948   3954   7592   9914   9946   9950   9952   9954   9955   9956   9957   9960   9964
   9967   9968   9970   9971   9976   9977   9978   9979   9980   9981   9983   9985   9986  10093  10101  14964  14965  14966  14967  14968  14969  14970
  34536  34537  34539 125920 125921 125922 125923 146195 146606 146607

However, there seem to be two more tasks having the OpenML100 tag which are not listed by task/list: Just look at https://www.openml.org/t/34538 or https://www.openml.org/t/3567. Here I can see a "OpenML100" tag. Whats going on here?

Also related to this:
https://www.openml.org/api/v1/json/study/OpenML100/ and
https://www.openml.org/api/v1/json/task/list/tag/OpenML100/ give me two different lists of task.ids .

Start by comparing the responses from /api/v1/json/task/list/tag/OpenML100/ and /api/v1/json/study/OpenML100/, then check the task pages for 34538 and 3567. Trace how these entry points select tagged tasks and identify why their task ID lists differ; done means the endpoints consistently account for all tasks displaying the OpenML100 tag.