A pipeline in Azure Data Factory loses certain fields, yet a newly created pipeline with the same setup does not.

Question

In Azure Data Factory, a pipeline consists of two activities: one is a Web Activity and the other is a Copy Data Activity. The pipeline first acquires a token through the Web Activity and then uses the token to retrieve data from the Synapse database. However, for about a week, two fields of data have been completely lost in this pipeline, namely managerId and managerName. After recreating the pipeline, the user found that all information is visible in the newly created pipeline without any field loss. The configurations of these two pipelines are identical, and the user wants to know why one pipeline is unable to read certain fields.