Running the stop command says the "server has been stopped" and does turn off. However, it doesn't fully exit and the process stays running. Tested via "CONSOLE" and "INGAME" and I get the same results and it does not exit properly.
[05:51:09] [Server thread/INFO]: Stopping server
[05:51:09] [Server thread/INFO]: Saving players
[05:51:09] [Server thread/INFO]: Saving worlds
[05:51:09] [Server thread/INFO]: Saving chunks for level '19w04b'/minecraft:the_nether
[05:51:09] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[05:51:09] [Server thread/INFO]: Saving chunks for level '19w04b'/minecraft:the_end
[05:51:09] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[05:51:09] [Server thread/INFO]: Saving chunks for level '19w04b'/minecraft:overworld
[05:51:10] [Server thread/INFO]: ThreadedAnvilChunkStorage (19w04b): All chunks are saved
[05:51:10] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[05:51:10] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[05:51:10] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[05:51:10] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[05:51:10] [Server thread/INFO]: ThreadedAnvilChunkStorage (19w04b): All chunks are saved
[05:51:10] [Server thread/INFO]: ThreadedAnvilChunkStorage (19w04b): All chunks are saved
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However, this issue is a Duplicate of MC-139758.
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Please do not mark unreleased versions as affected.
You don't have access to them yet.