You say 'in most cases' and 'usually', I'm guess not always, and not all the time. Probably unusual for a 787 to use LOWI, can you please spawn in using the A320 and try please?
If you read my post above, for me, there are pushback services for the A320, because I can actually pushback, however, they are invisible. Now, the issue is not a big problem for me, but for others it may be.