Cannot delete sequence after specifying segmentation as proxy node

I cannot delete sequences, once I add a segmentation as proxy node to a sequence in the same browser. Could somebody please look into this issue?
I tested this with version 2019-07-04 (BTW, there is no Sequences extension in today’s Extension Manager for Windows). Here is a screen video of the issue:!AhiABcbe1DBygu57EAFEs6T-O6sdDQ

This will be fixed by

Thanks, Sequences is there for Windows today.

FYI, the original issue may be fixed tomorrow by
I will test again tomorrow.

This problem is still there in today’s version. I think the list widget does not update correctly when a sequence is deleted. But I’m not sure why the problem only occurs after a segmentation is specified as proxy node.