For 10.14.6 what does "Improves file-sharing reliability over SMB" mean, specifically?

Note

When answering please add references/links for any claims made. Answers based on guesses or assumptions will be deleted.

macOS 10.14.6 was just released. One of the lines is "Improves file-sharing reliability over SMB". What specifically has changed?

Solution 1:

Apple does not normally provide the level of detail you seek. It doesn't even provide that level to developers and beta-testers in the pre-release seeds for testing purposes.

It may eventually be deduced by sufficient people who used to have a particular problem in that area all reporting some improvement. It may also be uncovered by researchers delving into system files and uncovering relevant strings or other data.