Fix Default Overwrite of Explain Query Format

Why it matters

The fix addresses a problem reported in issue #12432 where the output format of EXPLAIN queries was unintentionally overwritten, leading to incorrect or unexpected explanation results. This ensures users receive the correct query explanation in the specified format.

How to use it

Users can rely on the EXPLAIN query to produce output in their requested format without it being overridden or reset to a default. No special action is required; the fix is applied automatically once the update is installed.