Splunk Dashboard Studio, Tokens behaviour with chained searches - splunk

Question

Since the last Splunk update I've noticed some unexpected behavior when it comes to tokens with Splunk Dashboard Studio.
If you have an input (dropdown or multiselect) with a default value set to None.
After loading the dashboard page, then setting the input value,
The base searches in the dashboard that use the input token will update,
but any chain searches of that base search do not.
It does however update if you either refresh the page with the tokens set in the url, or a change to the input for a second time. (any other action which causes the page to refresh in some way eg: editing page will update the dashboard and the chain search will update)
is this behaviour a bug, and is there currently a way to fix this behaviour?
Thanks Daniel
Below is a self contained minimal example to demonstrate this.
Splunk Dashboard Studio: Absolute/Full control layout
{
"visualizations": {
"viz_cdPoxmBV": {
"type": "splunk.table",
"dataSources": {
"primary": "ds_CJTH14Fk"
},
"title": "Base"
},
"viz_t4aAHmKH": {
"type": "splunk.table",
"title": "Chain",
"dataSources": {
"primary": "ds_aqLh17e3"
}
}
},
"dataSources": {
"ds_CJTH14Fk": {
"type": "ds.search",
"options": {
"query": "| makeresults\n| eval a=\"$input$\"\n| table a ",
"queryParameters": {
"earliest": "0",
"latest": ""
}
},
"name": "Search_Base"
},
"ds_aqLh17e3": {
"type": "ds.chain",
"options": {
"extend": "ds_CJTH14Fk",
"query": "| eval a=a+\"_END\""
},
"name": "Search_1"
}
},
"defaults": {
"dataSources": {
"ds.search": {
"options": {
"queryParameters": {
"latest": "$global_time.latest$",
"earliest": "$global_time.earliest$"
}
}
}
}
},
"inputs": {
"input_aXQ6s8I2": {
"options": {
"items": [
{
"label": "All",
"value": "*"
},
{
"label": "Item 1",
"value": "item001"
},
{
"label": "Item 2",
"value": "item002"
}
],
"token": "input"
},
"title": "Dropdown Input Title",
"type": "input.dropdown"
}
},
"layout": {
"type": "absolute",
"options": {
"display": "auto-scale"
},
"structure": [
{
"item": "viz_cdPoxmBV",
"type": "block",
"position": {
"x": 10,
"y": 10,
"w": 410,
"h": 140
}
},
{
"item": "viz_t4aAHmKH",
"type": "block",
"position": {
"x": 430,
"y": 10,
"w": 400,
"h": 140
}
}
],
"globalInputs": [
"input_aXQ6s8I2"
]
},
"description": "",
"title": "Test_Token"
}
below is classic dashboard example where behaviour is not seen.
<form version="1.1">
<label>Test_Token</label>
<search id="baseSearch">
<query>| makeresults
| eval a="$input$"
| table a</query>
<earliest>-24h#h</earliest>
<latest>now</latest>
</search>
<fieldset submitButton="false">
<input type="dropdown" token="input">
<label>dropdown</label>
<choice value="*">All</choice>
<choice value="item001">Item 1</choice>
<choice value="item002">Item 2</choice>
</input>
</fieldset>
<row>
<panel>
<table>
<search>
<query>| makeresults
| eval a="$input$"
| table a</query>
<earliest>-24h#h</earliest>
<latest>now</latest>
</search>
<option name="drilldown">none</option>
</table>
</panel>
</row>
<row>
<panel>
<table>
<search base="baseSearch">
<query>| eval a=a+"_END"</query>
</search>
<option name="drilldown">none</option>
</table>
</panel>
</row>
</form>