Experience is not updated after UpdateAttributesPacket

Exp bar is not updated after sending UpdateAttributesPacket, but if i send TextPacket or change player inventory it updates successfully. This bug affects only experience, other things like hunger and health works fine. Tested on pmmp, nukkit, minet, local server.

Steps to reproduce:
1. Send UpdateAttributesPacket with exp level more than player have
2. Notice that it won't update
3. Send message to player and notice that bar updated

UPDATE
You can also test it on local server.
1. Host server on first device and connect from second to it.
2. On first device type
/xp 1L second_device_name
3. See that exp bar don't updates