When using JupyterLab (4.0.0 and up, at least), the MariaDB kernel affects the information displayed in the lefthand "Running Terminals and Kernels" sidebar.
Before using MariaDB kernel with a Python kernel up:

As soon as the MariaDB kernel is activated, KERNELS no longer shows information on running kernels. No info re the running MariaDB kernel is displayed, and the Python kernel info disappears:

JupyterLab has to be stopped to get the info back.