Thanks Mark. No idea why that first one didn't work but the second one 
works perfectly. I actually modified it slightly as follows, since I'm 
using this tiddler as a mask for several others so wanted them to be able 
to display different values.

\define tag-select-actions()
<$vars lf="[[" rt="]]" >
<$action-listops $tiddler=<<currentTiddler>> $field="tags" $filter={{{ 
[{!!_tag_selection}addprefix<lf>addsuffix<rt>]}}} />
</$vars>
\end

<$select field=_tag_selection actions=<<tag-select-actions>> >
<$list 
filter='[_object_type[location]!title<currentTiddler>!tag<currentTiddler>]'>
<option value=<<currentTiddler>> ><$view field='title'/></option>
</$list>
</$select>

Thanks again for your help


On Sunday, 27 December 2020 at 22:13:04 UTC Mark S. wrote:

> And here's a second version, that uses the action attribute. This is 
> probably closer to the "official" way things should be done, and is easier 
> to read.
>
>
>
> On Sunday, December 27, 2020 at 1:51:47 PM UTC-8 Mark S. wrote:
>
>> In case things got mangled in copy/paste, I've attached a JSON file with 
>> the code that you can import.
>>
>> On Sunday, December 27, 2020 at 1:47:58 PM UTC-8 Mark S. wrote:
>>
>>> It's hard to diagnose at a distance. But as you can see in the 
>>> screenshot, it's working on mine. Possibly something got mangled when you 
>>> copied the code?
>>>
>>> You could download your tiddler set in a JSON bundle, and then post them 
>>> here.
>>>
>>>
>>>

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