Using the pick block plus Ctrl doesn't correctly store player head data.
Process
-Do /give @p minecraft:player_head{SkullOwner:"Arkhitekton"}
-Place head
-Pick block plus Ctrl
-Drop either head on ground
-Use /data get entity @e[type=!minecraft:player,sort=nearest,limit=1] on both items
The data is incorrectly stores SkullOwner under BlockEntityData when it should be stand stand alone.
Broken data (pictured with steve looking head):
{Motion: [0.0d, -0.08d, 0.0d], Health: 5s, Invulnerable: 0b, Air: 300s, OnGround: 1b, Dimension: 0, PortalCooldown: 0, Rotation: [187.35873f, 0.0f], Thrower: [I; 1167036021, -2061807895, -2098501882, -97036261], FallDistance: 0.0f, Item: {id: "minecraft:player_head", Count: 1b, tag: {BlockEntityTag: {SkullOwner: {Id: [I; 1167036021, -2061807895, -2098501882, -97036261], Properties: {textures: [{Value: "ewogICJ0aW1lc3RhbXAiIDogMTU4ODYxNzQ3NjA1OCwKICAicHJvZmlsZUlkIiA6ICI0NThmOGU3NTg1MWI0ZWU5ODJlYjY3MDZmYTM3NTgxYiIsCiAgInByb2ZpbGVOYW1lIiA6ICJBcmtoaXRla3RvbiIsCiAgInNpZ25hdHVyZVJlcXVpcmVkIiA6IHRydWUsCiAgInRleHR1cmVzIiA6IHsKICAgICJTS0lOIiA6IHsKICAgICAgInVybCIgOiAiaHR0cDovL3RleHR1cmVzLm1pbmVjcmFmdC5uZXQvdGV4dHVyZS8yMGNjZGQ3ZDkxYzZmODZkMGY0YjM0NjgwY2FhMzg0MDQxNTJiMjlmMmQwMWMyYmJiODM3ZTg3M2E5YjdiYmJlIgogICAgfQogIH0KfQ==", Signature: "JFQEsHjmRD/pT/L8IW8LVbJYrCaaO85NVf9fz+KKowMfePQYWuSKWdiEWE8y0ArD1APEhr6FERrmL6N2rHT9/Cg6fc3/iw7WPuPF+ezZvORJX+iGP0oONVean8u6+guU+6D+j+ktCR/cFZ2y4nwKpUwmLSzQI4MaRmA8o7Lnz+Te9EhkEt0I4dyLp9WeuS/hZPaEQ/56xitn+YMWpIQ7aaUt0fmJ3FO6bmXfAZgzdGtsy7wDxMbJfohrdqMIQeXgnZpLQr5mzbTWcM9UxNUFFl91zsNM0yUCnPHwm63Sa7sukhAVrXgbzS4YDL7Upcu/4Nk3ouoPNFZQ07wLoNxoAx6vh02/3tXVAKe3QSrWFLZHeDtotfSSnbySAjKbB+0Z6uYUzNZuLBfIDRLDPPm4sOiXKrn4oZQY1X/da4+Hm1WQ1YP642cMVGt0NPyP01Lma64tqS+7YSKXTeXa9hRLPRct7ed7ZkesuIhres+IqnaETtHE1VWoKENt0JfjFAgUkPbKCxIkypa7Yc86UtlxYelxl9UCshZQSq99X8z1P1KOXCS0EHoxAMb4POxHiKxxucJBKwJH5g6hg7NCLvIuqxm08UTf2RaMNLI6r+xLWPUJhhe+UvHsTC2bFEoUzo+4AfblDLt2PUAImU/NVOvSQlsxL69VOHz9VyYcDmWzUfM="}]}, Name: "Arkhitekton"}, id: "minecraft:skull"}, display: {Lore: ['"(+NBT)"']}}}, Pos: [-723.9336198186408d, 67.0d, 1242.701667112239d], PickupDelay: 0s, Fire: -1s, UUID: [I; -1167692659, 265634925, -1085579815, 1252579681], Age: 155s}
Correct data (the picture of the one that looks like my own head):
{Motion: [0.0d, -0.08d, 0.0d], Health: 5s, Invulnerable: 0b, Air: 300s, OnGround: 1b, Dimension: 0, PortalCooldown: 0, Rotation: [187.35873f, 0.0f], Thrower: [I; 1167036021, -2061807895, -2098501882, -97036261], FallDistance: 0.0f, Item: {id: "minecraft:player_head", Count: 1b, tag: {SkullOwner: {Id: [I; 1167036021, -2061807895, -2098501882, -97036261], Properties: {textures: [{Value: "ewogICJ0aW1lc3RhbXAiIDogMTU4ODYxNzQ3NjA1OCwKICAicHJvZmlsZUlkIiA6ICI0NThmOGU3NTg1MWI0ZWU5ODJlYjY3MDZmYTM3NTgxYiIsCiAgInByb2ZpbGVOYW1lIiA6ICJBcmtoaXRla3RvbiIsCiAgInNpZ25hdHVyZVJlcXVpcmVkIiA6IHRydWUsCiAgInRleHR1cmVzIiA6IHsKICAgICJTS0lOIiA6IHsKICAgICAgInVybCIgOiAiaHR0cDovL3RleHR1cmVzLm1pbmVjcmFmdC5uZXQvdGV4dHVyZS8yMGNjZGQ3ZDkxYzZmODZkMGY0YjM0NjgwY2FhMzg0MDQxNTJiMjlmMmQwMWMyYmJiODM3ZTg3M2E5YjdiYmJlIgogICAgfQogIH0KfQ==", Signature: "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"}]}, Name: "Arkhitekton"}, id: "minecraft:skull"}, display: {Lore: ['"(+NBT)"']}}, Pos: [-723.9336198186408d, 67.0d, 1242.701667112239d], PickupDelay: 0s, Fire: -1s, UUID: [I; -1167692659, 265634925, -1085579815, 1252579681], Age: 155s}
Edit: Formatting
Thank you for your report!
We're actually already tracking this issue in MC-181529, so I resolved and linked this ticket as a duplicate.
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