Published Message Corrupted When Length Exceeds 7kb

[jiaaom]

While running on an ESP32, I've noticed that some of the MQTT messages sent by the device are corrupted. Messages longer than a certain amount will be corrupted. A special character like Ú3� would appear, then a new string appends to the older one. I have no issue with messages that has a short length.
Here's what I've got from the Web Console. Note that the first JSON string is being cutoff.

	"sampling_rate":	0,
	"fi_algo":	"simple",
	"timestamp":	1606359552245,
	"channel1":	[123456, 123456],
	"channel2":	[123456, 123456],
	"channel3":	[123456, 123456, 1232Ú3�/devices/device-u0/events�{
	"sampling_rate":	0,
	"fi_algo":	"simple",
	"timestamp":	1606359552918,
	"channel1":	[123456, 123456],

I appreciate your help!