This is indeed the result of a change in v5.1.18:

https://github.com/Jermolene/TiddlyWiki5/commit/35cbb127a3c21b7047517f1eeeff571a420b82ae

The problem was that the set widget was performing the same variable text 
substitutions as a macro definition. This behaviour was never documented, and 
was entirely inadvertent.

Meanwhile, it sounds like a behaviour that depended on that bug has been 
documented.

That puts us in the invidious position of being forced to either break 
backwards compatibility or to leave the original bug unfixed. To me, the 
original bug is much worse, and much harder to debug. (I mean that a text 
substitution that is unexpectedly not performed is much easier to spot than a 
text substitution that is unexpectedly performed).

Best wishes

Jeremy

--
Jeremy Ruston


> On 13 Dec 2018, at 06:27, TonyM <[email protected]> wrote:
> 
> Yes they will then !
> 
> If I had tried to do this without such documentation, I would have tried 
> <<currentTiddler>> first, but then that is just me.
> 
> Thanks Mark
> 
>> On Thursday, December 13, 2018 at 2:52:10 PM UTC+11, Mark S. wrote:
>> 
>> 
>>> On Wednesday, December 12, 2018 at 7:42:34 PM UTC-8, TonyM wrote:
>>> h0p3
>>> 
>>> I think perhaps it was fortunate it worked for you before, but marks 
>>> suggestion was possible always the best way to do it as it makes fewer 
>>> assumptions, clearly one of which is no longer valid.
>>> 
>> 
>> But it wasn't just fortunate -- it's the documented way! So if the change is 
>> real and permanent, then the docs need to be updated.
>> 
>> Have fun
>> -- Mark
> 
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