/data remove not completely remove empty compound tag from entity item when picked up

How to reproduce

1. Summoning item with custom tag inside an item, for example:

   /summon item ~ ~ ~ {Item:{id:"gold_ingot",Count:1b,tag:{SpawnXP:5}}}
   

2. Run in a repeating command block or function:

   execute as @e[type=item,nbt={Age:3s,Item:{tag:{SpawnXP:5}}}] at @s run data remove entity @s Item.tag.SpawnXP
   

3. Make sure you have normal item of gold ingot in your inventory. (16 items for testing)
4. Then picked up your item that has custom tag
   → The item doesn't stack together.

Video demonstrating the issue: https://www.youtube.com/watch?v=cGcBXvHKKLQ