Took me some days to recognize that it was the 13.4 update that did let my LG 32UN880 sleep.
Same problem here as described in this thread.
The only way to avoid the LG 32UN880 to really sleep is to manually put the MacBook to sleep from apple menu.
stooky
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I contacted apple support and apple developer support and filed a case, so at least apple should be area of it.