Custom operations missing in completion list

Given is a builder that defined a "body" custom operation. I expect that this "body" custom operation is shown in the completion list when being inside of a computation.

In the completion list shown below, the custom operation is not shown:


This is also *not* working:


In fact, the operation is present and recognized when it is used:


Using a pre-defined builder instance, the custom operation "body" is shown in the completion list (as expected):


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Might be related to:

#4832

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Microsoft Visual Studio Professional 2019
Version 16.9.5