Item frame (and item in it) dropped after comming back from the end, the chunks had been unloaded and loaded when spawning on a bed
When trying to set them back, it wont let you place the frame on the same position and after reloading the world the items have duplicated and the frames are back to normal
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Same thing happens when returning from the nether.

i get the same problem but my item frames don't break but duplicate along with the item in them

I get the same, but it occurs anytime I start the game.
Frames and Paintings that were stuck to oak plank wall immediately pop off the wall upon game startup. When attempting to reapply, frames and paintings do not stick to the wall and they disappear from inventory, but it doesn't drop the item again.
However, when you quit and restart the game, the missing frames and paintings reappear on the wall (then pop off again). If you collect the popped off version they continue to accumulate in your inventory and reappear after startup.
Maps that were in the frames also pop off and then reappear when you restart (meaning they duplicate/copy in your inventory.)

Yep, same thing happening in my crazy little snapshot house. It's full of framed maps and chest markers and every time I load, my inventory floods with dupes (in addition to lighting breaking, and inability to use a bed atm). Seems to be resolved already, at least. Here's hoping for a new snapshot soon!

I can confirm that coming back from the nether will pop off item frames and then when you relog the items and frames are on the floor with a new set where they came from

I am having the same issue as well. I am playing in snapshot 19w08b. When my saved game loads or when chunks are reloaded all the item frames drop as well as the item in them. I can collect everything, but it will not let me place the frame down where it was (but will let me place it above it). If I log out and back in, same happens again...allowing me to again loot everything, but still not replace the item frame/item.

If anyone can still reproduce this in the latest snapshot, please send me a copy of the world. I can't reproduce it with any of my test worlds.

https://bugs.mojang.com/browse/MC-138377?focusedCommentId=528844&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-528844
Well, I had it often since the latest two snapshots.

In 19w14a and b, how it exactly triggers... I don't know but it mostly happens when the chuncks don't load and I use the /kill command. When I walk in my base, all the item frames pop off the wall with all the items. When I go and place down the item frames, the item frames don't get placed but they get removed from my inventory.
When I reload the world, the item frames are still placed with the items in it and the items and item frames are also in the inventory.
If wanted, I can send over my world to you Searge.