When I put a repeating command block with "/item replace entity @p hotbar.0 with minecraft:red_wool 64", the items are there but I can's see them or place them. When I drop it, it still gets dropped. When opening the inventory, the blocks reappear. All the other hotbar slots work like normal.
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We're tracking this issue in MC-219018, so this ticket is being resolved and linked as a duplicate.
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LarsDeSuperKerel
Duplicate of MC-219018, which has been fixed in 1.17.1 Pre-release 1. You marked "1.17.1" as an affected version in this report however, your attachment states that you were playing in "1.17", therefore making it a duplicate. 😃