When you have low ping, after you place any block or charge an anchor, the slots switch back to the first item. This is very annoying, even if you use a crossbow or an elytra, If you're using explosive potions, then everything is fine and the slots change. Then why, with a ping of 100, is a player unable to change the slot after blocking, but can instantly change the slot when simply using any another items. This is very disruptive to the game and gives players with low ping a huge advantage in situations where quick action is needed. Please pay attention to this bug, as it has been in the game for about a year now and still not fixed.
We're tracking this issue at MCPE-191311, so I will resolve and link this report as a duplicate.
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