Painlessmesh: issue sending messages greater than 10K

I'm trying to send images in base64 from a mesh node with camera (ESP32-CAM) to a mqqtBridge node. But I noticed that if the final encoded image size is above about 10K, the bridge doesn't receive the data and the mesh connection goes down trying to reconnect in loop. If the message is lower than 10K the transmission occurs without problem. I've looked around for a size limit for the message but I haven't found nothing about it. Is it normal this behaviour?