If there are two pattern-matching callbacks for a dropdowns' options and value, the callback that changes the dropdown's options also triggers the other callback that uses the dropdown's value.

import dash
from dash import dcc, html, Input, Output, MATCH, ALL
import random

app = dash.Dash(__name__)
app.layout = html.Div([
    dcc.Dropdown(id="d1", options=[1, 2, 3]),
    dcc.Dropdown(id={'type': 'd2', "id": 1}, options=[]),
    dcc.Dropdown(id={'type': 'd2', "id": 2}, options=[]),
    html.Pre(id={"type": 'out', "id": 1}, style={'margin-top': '100px'}),
    html.Pre(id={"type": 'out', "id": 2}, style={'margin-top': '100px'})
])


@app.callback(
    Output({"type": 'd2', "id": ALL}, 'options'),
    Input('d1', 'value'),
    prevent_initial_call=True
)
def update_options(val):
    return [{
        1: ['a', 'b'],
        2: ['A', 'B'],
        3: ['x', 'y'],
    }[val] for _ in range(2)]


@app.callback(
    Output({"type": 'out', "id": MATCH}, 'children'),
    Input({"type": 'd2', "id": MATCH}, 'value'),
    prevent_initial_call=True
)
def update(_):
    return f'got_triggered_{random.randint(1, 10000)}'


if __name__ == "__main__":
    app.run_server(debug=True)

In the example above, when I use the dropdown 'd1' to change the options of 'd2's, the first callback triggers as expected but after that second callback also triggers where it is not supposed to.

pip list

• asyncstdlib 3.10.6
• boto3 1.26.96
• botocore 1.29.96
• Brotli 1.0.9
• cachelib 0.9.0
• cachetools 5.3.0
• certifi 2022.12.7
• charset-normalizer 3.1.0
• click 8.1.3
• colorama 0.4.6
• confuse 2.0.0
• Cython 0.29.33
• dash 2.9.2
• dash-bootstrap-components 1.4.1
• dash-core-components 2.0.0
• dash-html-components 2.0.0
• dash-table 5.0.0
• dnspython 2.3.0
• EditorConfig 0.12.3
• Flask 2.2.3
• Flask-Caching 2.0.2
• Flask-Compress 1.13
• gunicorn 20.1.0
• idna 3.4
• itsdangerous 2.1.2
• Jinja2 3.1.2
• jmespath 1.0.1
• jsbeautifier 1.14.7
• MarkupSafe 2.1.2
• more-itertools 9.1.0
• numpy 1.24.2
• pandas 1.5.3
• pip 23.0.1
• plotly 5.13.1
• pymongo 4.3.3
• python-amazon-sp-api 0.18.2
• python-dateutil 2.8.2
• python-dotenv 1.0.0
• pytz 2023.2
• PyYAML 6.0
• requests 2.28.2
• s3transfer 0.6.0
• setuptools 65.5.0
• six 1.16.0
• tenacity 8.2.2
• urllib3 1.26.15
• Werkzeug 2.2.3