When uploading a world file, the progress bar fills up but cannot be completed.
At this time, the total amount of data size to be uploaded is displayed on the right side, 
and the size of the files uploaded so far is displayed on the left side, 
but the number on the left side is larger than the number on the right side.
This phenomenon occurs with or without behavior packs and resource packs.

The exact time of occurrence of this phenomenon is unknown.
But I think it was happening since 1.19.40.

I think that there are some similarities with REALMS-474 , but since the details such as the displayed text are different, I decided that it was a different problem and created a new one.