init commit

data/hide_item_frames/advancement/interact_item_frame.json

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+{
+  "criteria": {
+    "item_frame_use": {
+      "trigger": "minecraft:player_interacted_with_entity",
+      "conditions": {
+        "entity": {
+          "type": "minecraft:item_frame"
+        }
+      }
+    }
+  },
+  "rewards": {
+    "function": "hide_item_frames:crouch_check"
+  }
+}

data/hide_item_frames/function/crouch_check.mcfunction

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+#if player is crouching hide frame
+execute if predicate hide_item_frames:is_sneaking run function hide_item_frames:hide_frame
+# reset advancement so it can fire again
+advancement revoke @a only hide_item_frames:interact_item_frame

data/hide_item_frames/function/hide_frame.mcfunction

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+data modify entity @e[type=item_frame,limit=1,sort=nearest] Invisible set value true

data/hide_item_frames/function/load.mcfunction

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+#make sure advancement is reset
+advancement revoke @a only hide_item_frames:interact_item_frame

data/hide_item_frames/predicate/is_sneaking.json

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+{
+  "condition": "minecraft:entity_properties",
+  "entity": "this",
+  "predicate": {
+    "flags": {
+      "is_sneaking": true
+    }
+  }
+}

data/minecraft/tags/function/load.json

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+{
+    "values": [
+        "hide_item_frames:load"
+    ]
+}

pack.mcmeta

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+{
+  "pack": {
+    "pack_format": 81,
+    "description": "crouch to hide item frame when placing an item in it"
+  }
+}