Put the summary of the bug you're having here
What I expected to happen was that Minecraft Realms was supposed to be running normally, and when it came to Structure Blocks, it should have kept the structure file I saved for a stage set I made just a few hours ago.
What actually happened was that two of my friends online kept getting kicked off due to the "server forcibly closed by a remote host" error several times within the course of half an hour, and when I logged in myself, I found that the latest version of my progress was reverted back to when I was almost finished the stage set design I made, and the Structure Block save I set up doesn't seem to exist, which will force me to have to finish that mini project again from that point it was left off at.
Environment
Java Edition 1.14.3 which is being run on my MacBook Air.
Duplicates MC-38565 (invalid). See the mod notice on that ticket for possible solutions.