Powerapps delegation notice - Filter and Isblank function

Question

I created an app on Microsoft Powerapps using the Database Oracle and it shall submit a notice of delegation.

WHAT I INTEND TO DO: On this screen I need to recover all the vehicles that are within the company, and all the records that are with the field FUNCIONARIO_SAIDA null should appear on this screen.

This warning appears in the following function:

Filter('MICROSOFT.APP_PORTARIA_FLUXO'; IsBlank(FUNCIONARIO_SAIDA))

To make it easier to understand the problem, follows below the image of how it is at the moment:

The delegation notice exists to inform that the function can bring problems in the future, where Powerapps will not be able to return all records of this query, but I have not found any formula that can replace.

UPDATING:

I also tried the code below, at first no delegation notice appeared, but then appeared again:

(Filter('MICROSOFT.APP_PORTARIA_FLUXO'; Text(DATA_SAIDA) = "")