Azure Data factory bug when creating dataset - error 800000 char limit exceeded in ARM template

Question

i have a fairly complex data factory 18 pipelines, 120+ datasets 26 Dataflows. it has been working fine until last week when i tried adding a new dataset. 155943-alltogether.png
You can see that i am adding the dataset and spec the file path that it will point to in one operation.

it takes as much as 10seconds to execute this task

on publishing you get the following error155934-fail.png

i discovered after a week of tearing my hair out and learning about ARM templates
that you can get around this bug by

Adding a new dataset but not spec the file path leave as the root

publish the dataset ... all fine

Edit the newly created dataset, spec the file path you want the dataset to point to

publish, all is fine

Observations the first does not take 10s, it returns instantly

Answer 1

I have submitted your feedback @Steve Waterfield .

FYI: This issue can happen when any parameter exceeds the limit.