When armor stands are broken by the player (swords, fireworks, etc). Armor stands break and drop the armor they are holding, but not themselves as items.
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Cannot reproduce. Please provide a video with the debug screen enabled (hit the F3 key) demonstrating the issue.
Also if this happens, please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.
In the video you provided, you destroyed the armour stands with a firework, therefore making this ticket a duplicate of MC-198669. When an armour stand is destroyed by fireworks, it will not drop as an item and will instead be destroyed, hence the reason you are experiencing this problem. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.
What is the gamerule
doTileDropsset to? If it's set tofalse, the armour stand will not drop as an item upon destroying it.