version: 6.0.8

dataset:

{ "_id" : ObjectId("64dc9c1ecfae2bd697a5b725"), "_widget_1692174497931" : "视频号❤️", "_widget_1692174497932" : 1 }

,

{ "_id" : ObjectId("64dc9c2f77859fe282e9491a"), "_widget_1692174497931" : "视频号❤", "_widget_1692174497932" : 2 }

 
case1:
 
db.data.aggregate([
    {
        $match:

{             "_widget_1692174497931": "视频号❤"         }

    }
], {
    collation:

{         locale: 'zh'     }

})
 
result:

{ "_id" : ObjectId("64dc9c1ecfae2bd697a5b725"), "_widget_1692174497931" : "视频号❤️", "_widget_1692174497932" : 1 }

,
 

{ "_id" : ObjectId("64dc9c2f77859fe282e9491a"), "_widget_1692174497931" : "视频号❤", "_widget_1692174497932" : 2 }

 
case2:
db.data.aggregate([
    {
        $match:

{             "_widget_1692174497931": "视频号❤"         }

    }
])
 
result

{     "_id" : ObjectId("64dc9c2f77859fe282e9491a"),     "_widget_1692174497931" : "视频号❤",     "_widget_1692174497932" : 2 }

 
The two cases are only  collation.locale different。I'm guessing it might have something to do with Unicode
 
❤️  \u2764\ufe0f
❤  \u2764
Looking forward to your response！Thanks