Why some of the column data is not posted to log analytics workspace though it is showing in logs of Azure Function App?

Question

I have created a timer trigger function app that is ingesting data into Azure Log Analytics Workspace. while ingesting data I have printed the logs and it is showing the data that will be pushed to log analytics workspace the log is in below image.

but when we see the data in the log analytics workspace two column data is missing in some of the rows. for example in above image portfolioName with eventId 1025498 is there while pushing the data but you can see the below image that the portfolioName is not there in the data with that eventId (Note : eventId is unique.)

--> This is also happening for portfolioId as portfolioId is available in logs but not available in the log analytics workspace.